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WorksheetsSolving Systems Substitution/Elimination Test
Total questions: 125
Worksheet time: 11hrs 40mins
What order is the 5 steps for elimination method?
Place in Standard Form
Determine which variable to eliminate
Add or subtract the equations
Plug variable back into equation
Check your solution
What are the five steps to solving systems using substitution method.
Solve an equation for one variable
Substitute
Solve the equation
Plug back in to find the other variable
Check your solution
In this system
x+3y=9
4x-2y=-6
it'll be easiest to start by solving the first equation for x.
The result of doing so is x=
(a)
In this system
x+3y=9
4x-2y=-6
it'll be easiest to start by solving the first equation for x.
The result of doing so is x=9-3y.
Fill in the blanks to plug that expression in and solve for y:
4(9-3y)-2y =-6
36-12y-2y=-6
36-14y =-6
-14y= (a)
y= (b)
In this system
x+3y=9
4x-2y=-6
we have figured out that x=9-3y, and y=3.
Complete the steps to solve for x:
x=9-3( (a) )
x=9- (b)
x= (c)
The solution to the system is ( (d) , (e) ).
Put the steps for solving by ELIMINATION in order:
Make sure the equations are lined up
Multiply one or both equations by a number to get common but opposite coefficients
Subtract the equations to eliminate one variable
Solve for the remaining variable
Plug that number into either original equation and solve for the other variable
Consider the system
4x+3y=-1
5x+4y=1
Let's say I want to eliminate the y's. What is the least common multiple of 3 and 4?
LCM = (a)
Multiply each equation by a number so that the coefficient of y will be 12, with one positive and one negative.
(b) (4x+3y=-1)
(c) (5x+4y=1)
Consider the system
4x+3y=-1
5x+4y=1
After we do this multiplication, what will the new equations be?
4(4x+3y=-1) ---> (a) x + (b) y= (c)
-3(5x+4y=1) ---> (d) x - (e) y= -3
Consider the system:
4x+3y=-1
5x+4y=1
Which we converted to:
16 x + 12y=-4
-15x - 12y= -3
Combining the equations straight down gives us:
(a) x+ (b) y= (c)
Solving for x, we get x= (d)
Consider the system:
4x+3y=-1
5x+4y=1
Since we now know that x=-7, solve for y:
4( (a) )+3y=-1
(b) +3y=-1
(c) = (d)
y= (e)
Solve for y:
4x-y=3 ---> y= (a) x (b)
Put the steps for solving by SUBSTITUTION in order:
Solve one equation for x or y
Plug the resulting expression into the other equation
Solve for the first variable
Plug that number into the other equation
Solve for the second variable
what is the variable that will be "eliminated"?
5x - 4y = 11
5x + 4y = -14
x variable
y variables
both variables
What would be the first step in finding the solution using elimination?
2x + 2y = -2
3x - 2y = 12
you cannot solve this using elimination
cross out the 2x and 3x
Add the like terms. The y terms will zero out.
change to slope intercept form and graph
Solve the system by elimination. Show all work.
3x + y = 19
2x - y = 6
(5, 14)
(4, 5)
(5, 4)
(14, 5)
Solve by elimination:
-9x - 4y = -20
5x + 4y = 4
(-4,4)
(4,4)
(4,-4)
(-4,-4)
what does the top equation need to be multiplied by to create a zero pair?
2x - 6y = 20
2x + 5y = -11
-1
1
-2
2
what do you need to multiply the top equation by to make a zero pair:
5x - 2y = 11
-10x + 3y = -4
5
-1
2
-2
4x-6y= -6
-2x-12y= -12
(0,1)
(1,0)
(1,1)
(2,1)
3x + 7y = 23
-3x - 7y = -17
No solution
Infinite number of solutions
(-3,3)
(3,3)
10x − 7y = −18
−6x + 6y = 0
9x − 8y = 4
-6x - 7y = -10
-4x - 14y = 28
y = 4x + 5
y = x – 4
4x-6y= -6
-2x-12y= -12
4x + 12y = −1
−3x − 9y = 0
-12x-4y= -8
-6x-2y= -4
How many solutions are there in the system of equations?
No Solution
Infinitely Many Solutions
One Solution
Two Solutions
What is the number of solutions to the system of equations?
No Solution
Infinitely Many Solutions
One Solution
Two Solutions
What is the solution to the system of equations?
(-1, 1)
(3, 1)
(1, 1)
(-3, 1)
What would be the first step in finding the solution using elimination?
2x + 2y = -2
3x - 2y = 12
you cannot solve this using eliminiation
cross out the 2x and 3x, because when you add them, they equal 0
cross out the 2y and -2y because when you add them, they equal 0
change to slope intercept form and graph
4x + 8y = 20
-4x + 2y = -30
When you solve these equations using the elimination method, which variable will be eliminated?
The x
The y
The z
The unknown
The coefficients of the eliminated variable must be _____.
opposites
the same
distinct
does not matter
When solving for y , the coefficients of __ need to be opposites.
x
y
x and y
When solving for x , the coefficients of __ need to be opposites.
x
y
x and y
Look for ____ when determining which variable to eliminate. Select all that apply
same coefficeints with opposite signs
easy numbers to multiply to (common factors)
different coefficients
vertical alignment of like terms
To find the second variable, substitute the x or y you solved for into one of the ____.
original equations
one of the manipulated equations
the top equation, always
the bottom equation, always
Order the algorithm (steps) to elimination
Align like terms vertically
Determine the variable to eliminate
multiply equation(s) to have opposite coefficients, if necessary
add vertically
Solve for variable
Let's multiply the top equation by -2. What would be our new equation?
2x + 3y = 12
4x - 7y = - 54
4x - 6y = -24
-4x - 6y = 12
-4x - 6y = 24
-4x - 6y = -24
-4x - 6y = -24
4x - 7y = - 54
Let's combine (add) these 2 equations to ELIMINATE the x variable. What would our combined equations be?
-1y = 30
13y = -30
-1y = -78
-13y = -78
10x − 7y = −18
−6x + 6y = 0
9x − 8y = 4
-6x - 7y = -10
(-4, -2)
-4x - 14y = 28
y = 4x + 5
y = x – 4
4x-6y= -6
-2x-12y= -12
4x + 12y = −1
−3x − 9y = 0
-12x-4y= -8
-6x-2y= -4
How many solutions are there in the system of equations?
No Solution
Infinitely Many Solutions
One Solution
Two Solutions
What is the number of solutions to the system of equations?
No Solution
Infinitely Many Solutions
One Solution
Two Solutions
What is the solution to the system of equations?
(-1, 1)
(3, 1)
(1, 1)
(-3, 1)
Type the solution to the system of equations as an ordered pair, (x,y).
(a)
An ordered pair that satisfies both equations in a system of linear equations is called a (a) to the system of equations.
Solve for x and y using substitution
y = 2x + 1
y = 4x - 1
(1,3)
(-1,-3)
(-1,3)
(3,1)
Solve by substitution:
y = 3x + 14
y = -4x
Type your answer as (x, y)
(a)
Which problem would be easier to solve by substitution?
y + x = 3
2y + x = 6
3y - x = 7
2y = x + 6
5x - 2y = 6
x + y = 2
y = 2x + 2
x + y = 7
Reorder the following steps for solving systems of linear equations by substitution
Locate the isolated variable (nickname)
Plug the solution into the original equation (nickname)
Use the "nickname" in the other equation
Plug the answer into the either equation to solve for the other variable
y = -1x - 5
4x - 8y = 4
y = 7x + 9
2y + 2x = -18
x= 7 - 2y
2x + y = 5
x = -3y - 17
2x + 3y = -7
y=8x+1
y=6x+3
y = 4x - 10
y = 3x - 5
y= 4x + 3
2x - 3y = 21
y = x + 5
4x + y = 20
y = 2x + 1
y = 4x - 1
y = 4x + 1
3x + 2y = 13
y = 3x - 8
y = 4 - x
2x - 2y = 2
y = -5x + 14
Solve the following systems of equations using substitution:
y = 8
y = -4x + 4
(8, -1)
(-28, 8)
(-1, 8)
(8, -28)
Solve the following systems of equations using substitution:
x = 6
y = 2x - 3
(6, 6)
(6, 9)
(9, 6)
(9, 9)
How many solutions does the graph have?
One solution
No solution
Infinite solutions
Solve the following systems of equations using substitution:
y = 3 - x
3y + x = 5
No solution
(1, 2)
(3, 0)
(2, 1)
Solve the following systems of equations using substitution:
2y + x = -15
x = 3y
(-3, -9)
(-9, -3)
(-3, 9)
(9, -3)
y = x + 5
4x + y = 20
Warm up: #3
Match the solution to the system of equations.
(-2, -1)
(2, -1)
(1, 4)
(-4, -1)
Solve the following system:
−2x−3y=−7
(2, 1)
(1, 3)
(2, 5)
(3, 2)
y = 2x + 9
x = -3
(-3, -33)
(-3, 8)
(-3, 3)
(3, -3)
6x = y
3y - 4x = 42
(3, 18)
(8, 2)
(2, 8)
(1, 6)
y = 2x - 4
7x - 2y = 5
(-1, -6)
(-1, -8)
(-2, 6)
(1, -8),
y=8x+1
y=6x+3
Find the solution of the system of equations below using the substitution method:
y = 2x - 4
7x - 2y = 5
(-1, -6)
(-1, -8)
(-2, 6)
(1, -8),
Solve the system of equations.
(-6, 1)
(-12, -12)
(1, -6)
No solution
Infinite solutions
No Solution
(2, 2)
(-1, 2)
(-1, -2)
4x + y = 17
y = 2x - 11
2x + 3y = 4
y= 5x - 27
5x + 4y= −14
y = −7x − 15
4x + 2y = 4
7x + y = 19
-x + y = -11
-9x + 5y = 18
x = -3y - 17
2x + 3y = -7
y = -6x - 13
3x + 2y = 8
-x + y = -11
(-5,6)
(6,-11)
(-6,-5)
(6,-5)
y = 2x + 1
y = 4x - 1
Solve by elimination:
(-7,0)
(6,0)
(-6,0)
(7,0)
Solve by elimination:
−9x−4y=−20
5x + 4y = 4
(-4,4)
(4,4)
(4,-4)
(-4,-4)
Solve by elimination:
7x+1y=−9
−3x−1y=5
No solution
(1,8)
(-2,-3)
(-1,-2)
Is (-3, -7) a solution the system:
y = 4x + 5
y = x – 4
YES
NO
Solve the system:
3x+1y=19
2x−1y=6
(5, 14)
(4, 5)
(5, 4)
(14, 5)
Check to see if (-2,1) is a solution to the following system:
x + 2y = 0
4x + 3y = 1
YES
NO
Is (1,10) a solution to the system:
y = 7x + 5
y = x + 9
YES
NO
Is (1,7) a solution to the system:
y = 3x + 4
y = x + 6
YES
NO
Is (0,2) a solution to the system:
3x + 2y = 4
8x - 3y = -6
YES
NO
Is (5, 2) a solution to the system:
x + y = 7
x - y = 4
YES
NO
Solve by elimination.
3x+y=−1
4x−y=−13
(2 , 5)
(-2 , 5)
(2 , -7)
(-2 , -7)
Solve by elimination.
4x+5y=5
4x+3y=11
(-5 , -3)
(-5 , 3)
(5 , -3)
(5 , 3)
Solve by elimination.
2x+4y=−8
4x+5y=−1
(6 , 5)
(6 , -5)
(5 , 6)
(5 , -6)
Four times a number minus three times another number is thirteen. The sum of the two numbers is twelve. What are the two numbers? Use a system of equations to solve the problem.
3 and 9
-3 and 15
5 and 7
-5 and 17
Bailey and Chloe went to the fair. Bailey bought two hotdogs and a soda for $5.50. Chloe bought a hotdog and two sodas for $5.00. Find the cost of a hotdog and the cost of a soda. Use a system of equations to solve the problem.
hotdog: $2.50
soda: $1.00
hotdog: $1.00
soda: $2.50
hotdog: $1.50
soda: $2.00
hotdog: $2.00
soda: $1.50
