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x1= 2 y1= -2
3x + 4y= 12 diubah menjadi 4y= -3x + 12
4y= -3x + 12
y= -3/4
m1= -34
karena tegak lurus maka:
m1 × m2= -1
-3/4 × m2= -1
m2= -1 : -3/4
m2= -1 × -4/3
m2= 4/3
y-y1= m2(x-x1)
y-(-2)= 4/3(x-2)
y+2= 4/3x-8/3
y= 4/3 - 8/3 -2
3y= 4x - 8 - 6
3y= 4x - 14
atau
4x-3y-14= 0