Solve each system by substitution.

x+8y=-15

7x + 8y=-9

(1,-2)

Step-by-step explanation:

x+8y=-15

7x+8y=-9

put x in right and make it a -

8y=-15-x

7x+8y=-9

use 8y to substitute into an equation

7x-15-x=-9

subtract 7x to x

6x-15=-9

add 15 to - 9

6x=6

divide both sides by 6

x=1

substitute 1 to an equation

7x+1+8y=-9

solve

y=-2

(1,-2)