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OpenStudy (anonymous):
(-1,20) perpendicular to the graph of 4x+20y=15
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OpenStudy (amistre64):
x +5y = 99 perhaps?
OpenStudy (amistre64):
nope.... -5x +y = 25
OpenStudy (anonymous):
y=mx+c 20y=-4x+15 divide all through by 20 gradient will be -1/5 perpendicular is normally if you get the product it becomes -1 thus : -1/5 * x=-1 so x=5 so amistres is correct
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