Solving by Elimination Method

-8x - 7y = 10
-8x + 5y = 34
answers in (x,y)

• No Solution

• (-3, -10)

• (3, 2)

• (-3, 2)

4x+8y=20

-4x+2y=-30

• (-7,1)

• (2,-5)

• (-2,5)

• (7,-1)

x = -3y - 17

2x + 3y = -7

• (1, -2)

• (3, 0)

• (-5, -2)

• (10 , -9)

• (10, 2)

Solve the system of equations:

3x + y = –21

x + y = –5

• (-3,8)

• (8,-3)

• (3,-8)

• (-8,3)

What is the purpose of multiplying the equations in the elimination method?

• To waste time and effort

• To confuse the person solving the equations

• To make the equations look more complicated

• To create opposite coefficients for one of the variables

Which is the best method for solving this system of equations?

• Substitution

• Elimination

• Graphing

Which is the best method for solving this system of equations?

• Elimination

• Substitution

• Graphing

Should you use the Substitution or Elimination method to solve this system of equations?

• Substitution

• Elimination

How many solutions does this system of equations have?

• One Solution

• No solution

• Infinitely Many Solutions

• Two Solutions

Using the elimination method, which variable should be eliminated first?

• x is ready to be eliminated without any changes to the equations

• y is ready to be eliminated without any changes to the equations

• x, but you have to multiply one of the equations by -1 to change the signs

• y, but you have to multiply one of the equations by -1 to change the signs