It is simple if you put it in slope-intercept form.
y=mx +b is where m=slope and b=y-intercept
-4x+5y=20
bring the 4x over to the other side
5y=4x+20
divide both sides by 5
y=4/5x+4
y=mx+b
b=4
y-intercept=4
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There is no slope nor intercept because there is no equation, simply an expression.
4x+2y = 20 2y = -4x+20 y = -2x+10
4x-15=6x-4x 4x-22.4=2x 2x=22.4 x=11.2
-4x+3 = 23+6x -4x-6x = 23-3 -10x = 20 x = -2
4x-5y+20 = 0 -5y = -4x-20 y = 4/5x+4 which is now in slope intercept form