Because we have x = 3, we can substitute it. But first, let's convert 2x + 4y = 14 into y-slope intercept form.
2x + 4y = 14
Subtract 2x from both sides.
4y = -2x + 14
Divide both sides by 4.
y = -1/2x + 3.5
Now substitute.
y = -1/2(3) + 3.5
y = -1.5 + 3.5
y = 2
(3, 2)