Systems of Equations Eliminations

what would the top equation become when you multiply everything by -1?

• 2x - 6y = 20

• -2x - 6y = -20

• -2x + 6y = 20

• -2x + 6y = -20

Solve for x.

(just the number)

Mathematical Equivalence

OFF

what is the variable that willl be "eliminated"?

5x - 4y = 11

5x + 4y = -14

• x variable

• y variables

• both variables

Solve for y.

(just the number)

Mathematical Equivalence

ON

• A

• B

• C

• D

what is the resulting combined equation to the following system:

• 5x = -3

• 10y = -3

• 10x = -3

• 10x = -25

what number should you multiply the top equation to eliminate variable x by adding:

5x - 2y = 11

-10x + 3y = -4

• 5

• -1

• 2

• -2

Which variable will be eliminated?

• The x

• The y

• The z

• The unknown

What does the second equation need multiplied by so that the x's will eliminate?

• 2

• -1

• 4

• 0