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4y=-3x+8
y=-3/4
m1=-3/4
Karena tegak lurus maka :
m1×m2=-1
-3/4×m2=-1
m2=-1:-3/4
m2=-1×-4/3
m2=-4/3
melalui titik (1,2)
x1=1 y1=2
y-y1=m2(x-x1)
y-2=-4/3(x-1)
y-2=-4/3x+4/3
y= -4/3x+4/3+2
3y=-4x+4+6
3y=-4x+10
atau
4x-3y+10=0