14. $-3 x+y=4$

Step 1 ：Rearrange the equation to solve for y in terms of x: \( -3x + y = 4 \)

Step 2 ：Add \(3x\) to both sides: \( y = 3x + 4 \)

Step 3 ：\(\boxed{y = 3x + 4}\)