Can the equation y=4 be put into the form x/a + x/b = 1 to find the x intercept and y intercept of the line?

Answer 1

Your question belies a lack of understanding or the x and y intercepts.

y = 3 does not have an x-intercept!

The y-intercept is (0, 3).

Answer 2

y = 4 does not have an x-intercept.

y = 4 is the y-intercept.

Why convolute the problem?