Answer:
x = -3
Explanation:
3y + 7 = 5x
3y = 5x - 7
y = 5x/3 - 7/3 (Isolate y.)
7x - 3y = 1
-3y = 1 - 7x
y = -1/3 + 7x/3 (Isolate y.)
5x/3 - 7/3 = -1/3 + 7x/3 (Set the equations equal to each other. Simplify.)
5x/3 - 2 = 7x/3
-2 = 2x/3
-6 = 2x
-3 = x