The equation 5x+4y=20 represents a linear function in two variables. identify the slope, x-intercept and y-intercept of this linear function

Here are the steps
put it into y=mx+b 4y=-5x+20
to isolate y divide both sides by  y=-5/4+5
to find the xi 
xi is when y=0 so plug it in to the equation 4y=-5x+20 4(0)=-5x+20
0=-5x+20 subtract 20 from each side -20=-5x the negatives cancel out 20=5x
to isolate x divide each side by 5 x=20/5
20/5=4
Answers:
m=-5/4 
yi=5
xi=4