Question

Solve using substitution.
y = 8x + 7
y = -8x - 9

Answer 1

(-1,-1)

Explanation:

1) since both equations are equal to y, we can substitute the value of "y" in one equation to the value of y in another:

8x+7=-8x-9

combine like terms:

8x+8x=-7-9

16x=-16

x=-1

now substitute "x" as -1

8(-1)+7=-1

hence

x=-1

y=-1

so (-1.-1)

Answer 2

(-1,-1)

Explanation: