7x - 2 = 2y 3x = 2y - 1 Solve the system of equations by substitution. (3/4, 13/8), (1/4, -1/8), no solution, coincident

7x - 2 = 2y
7x = 2y + 2
so
7x = 2y + 2
3x = 2y - 1 
----------------subtract
4x = 3
  x = 3/4

7x - 2 = 2y
7(3/4) - 2 = 2y
21/4 - 2 = 2y
21/4 - 8/4 = 2y
13/4 = 2y
so
y = 13/4 * 1/2
y = 13/8

answer
(3/4, 13/8)