if y=3x and 4x - 2y=5, then x = ?

y = 3x (1)

4x - 2y = 5 (2)

Sub (1) into (2) and we have

4x - 2 (3x) = 5 simplify

4x - 6x = 5

-2x = 5 divide both sides by -2

x = -5 / 2