Question

Find the intercept of x-y=4

Answer 1

x intercept : (4,0)

y intercept: (0, -4)

Answer 2

To find the x-intercept, set  y=0 to get x-0=4  => x=4 as the x-intercept.
Similarly,
To find the y-intercept, set  x=0 to get 0-y=4  => y=-4 as the y-intercept.

This works for all linear equations in two unknowns.