Solving Systems of Equations by Elimination with Addition and Subtraction

What do you have to multiply the first equation by to have the x's be opposite and the same?

• 3

• 2

• -2

• -3

Solve the system of linear equations by elimination.

-x + y = -13

-8x - 4y = -8

• (5, 8)

• (5, -8)

• (-5, -18)

• (-5, 8)

Solve by elimination. 
 2x + 4y = 10
-4x + 2y = -30

• (-7,1)

• (2,-5)

• (-2,5)

• (7,-1)

Solve the system:

8y+7x=-75

8y+9x=-5

• (-5, -5)

• (40, -35)

• (-5, 5)

• (35, -40)

• (-35, 5)

Which method would be the most efficient?

• Graph (or set equal)

• Elimination

• Substitution
  

Which variable will you eliminate in this system?

• x

• y

Using the elimination method, what operation should you use to solve this system of equations?

• addition

• subtraction

• multiplication

• division

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

3x - 5y = 20

-3x - 2y = 15

• graphing

• elimination

• substitution

• (0,3)

• (1,-1)

• (-3, 1)

• (1,3)