we know that the equation is 4y=-x+20
Thus y=-1/4(x)+5
Thus thus the x intercept is (0,20)
We also know it goes through (7,7)
We use this to find the slope which is rise/run
rise=-13
run=7
slope=-13/7
the equation is y=-13/7x+140/13
-13/7(20) is y intercept.