{y=x−7
{ 5x+2y=7

use the substitution method.

a- (−1, −8)
b- (3, −4)
c- (7, 0)
d- (0, −7)

Substitute value of y from equation 1st into 2nd, 
5x + 2y = 7
5x + 2(x - 7) = 7
5x + 2x - 14 = 7
7x = 7 + 14
x = 21 / 7
x = 3

Now, y = 3 - 7 = -4

In short, Your Answer would be Option B) (3, -4)

Hope this helps!

X= -5because this is a single step equation so you would just have to divide -16 both sides for x to equal your solution