Lesson #9 Quiz: Elimination

Where do these lines intersect?
x-y=11
2x+y=19

• (10,-1)

• (-1,10)

• (3,-4)

• (6,7)

4x +  8y = 20
-4x + 2y = -30
Which variable will be eliminated?

• The  x

• The  y

• The  z

• The unknown

What is the first step in solving a system of equations by elimination/matrices?

• Get both equations in standard form and line up the like terms.

• Get both equations in slope-intercept form.

• Get both equations equal to zero.

• Put the x terms first.

4)  -6x+5y=1
           6x+4y=-10

• (1,1)

• (-1,-1)

Solve by elimination:
7x+y=-9

-3x-y=5

• No solution

• (1,8)

• (-2,-3)

• (-1,-2)

Solve by elimination:

 $4x\ +\ 9y\ =\ 28$  

 $-4x-1y\ =-28$  

• (-7,0)

• (6,0)

• (-6,0)

• (7,0)

Solve the system:
 $3x+1y=19$  
 $2x-1y=6$  

• (5, 14)

• (4, 5)

• (5, 4)

• (14, 5)

Buzz graphed two lines in order to find the solution to a given system of equations.
What is the solution?

• (-1, 4)

• (1, -4)

• (-4, 1)

• (4, -1)

Solve the system of equations by elimination.
-x + y = -13
-8x - 4y = -8 

• (5, 8)

• (5, -8)

• (-5, -18)

• (-5, 8)

Which of the following is not a method to solve systems?

• Elimination

• Difference of Squares

• Substitution

• Graphing