Question

3x – 7y = 5
9y = 5x + 5

Answer 1

A.
(–3, 2)
B.
(8, 5)
C.
(–10, –5)
D.
(0, 0)

Answer 2

3x - 7y = 5
y = 5/9 x + 5/9

3x - 7(5/9 x + 5/9) = 5
3x - 35/9 x - 35/9 = 5
3x - 35/9x = 35/9 + 5
3x - 35/9x = 80/9
-8/9 x = 80/9
multiply both sides by the reciprocal
x = (80/9)(9/-8)
x = -10

Answer 3

c

Answer 4

3(-10) -7y = 5
-30 -7y = 5
-7y = 35
y = -5

Answer 5

Yep

Answer 6

Do you know how to do these systems?

Answer 7

The method I used is called substitution, there is also solving through matrices (you will learn this in algebra 2) and elimination.