Question

Which ordered pairs in the form (x, y) are solutions to the equation (x + 7)y = 10? Choose all answers that are correct.  A.(−9, −5)  B.(−8, 10)  C.(−2, 2)  D.(3, 5)

Answer 1

What you do is to substitute the first number for x and the second for y:

(x+7)y=10

a):

(-9+7)*-5=10
(-2)*-5=10
10=10

yes, it's a solution!

b)
(-8+7)10=10
-1*10=10
-10=10

no, not a solution!

c) (-2+7)2=10
5*2=10
yes, a solution!!

d) (3+7)*5=10
50=10

no, not a solution!