Question

What would you multipy and to which equation to start solving by using the elimination method? Then would you add or subtract them?

7x + 4y = -4
5x + 8y = 28

Answer 1

multiply the first equation by -2, then add them

Explanation:

7x+4y=-4 *-2 7x+4y=-4 *-2 = -14x-8y=8

5x+8y=28

-14x-8y=8 x=-4, y=6

-9x=36

x=-4

7(-4)+4y=-4

-28+4y=-4

4y=24

y=6