4x+5y=20 I got y=-4/5+4

Nice, except that you missed the x out of the equation you got.

What intercept are you looking for exactly?

To get the y-intercept, set x = 0 and solve for y.
To get the x-intercept, set y = 0 and solve for x.

It's really simple if you have a graph in front of you.

Oh I see thank you