Question 129738
5x+4y-20=0 
5x+4y=20
x intercept occurs when y=0
5x=20
x=4
4 is the x intercept.
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4x+3y-12=0
3y=12-4x
y=4-4x/3
-4/3 is the slope of the line.
The slope of a line that is perpendicular is the negative reciprocal of the slope which in this case is 3/4
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Point slope form: 
line passes through the point (x[1],y[1]) and has a slope m
(x,y)=(4,0)
m=3/4
y-y[1]=m(x-x[1])
y-0=(3/4)(x-4)
y=3x/4 - 12/4
y=.75x-3
General form:
3x/4 - y - 3 =0
3x-4y-12=0 multiply each side by 4.
.
Ed
{{{graph(500,500,-10,10,-10,10,4-(4x/3),.75x-3)}}}