Question

y -2x=4 solve the equation for the variable y. What is y?

Answer 1

Simple...

you have y-2x=4

to solve for y..isolate the variable...

y-2x=4
  +2x +2x

y=2x+4

If, you want to find the y-intercept set x=0....

y=2(0)+4

y=4

(0,4)

Thus, your answer.