Question

6) Select the best method to solve the system.

5x-4y=7
4x-4y=12

*elimination
*substitution

Answer 1

Elimination

x=-5 and y=-8

Explanation:

-(5x-4y=7) <--- Multiply by a negative so that y can cancel out

4x-4y=12

=-5x+4y=-7

4x-4y=12

=-x=5

x=-5

5(-5)-4y=7 <--- plug x back in to solve for y

-25-4y=7

+25 +25

-4y/-4=32/-4

y=-8