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karena tegak lurus maka m2= 3/2
sehingga
y-y1=m2(x-x1)
<=> y-(-3)=3/2(x-5)
<=> y+3=3/2 x-15/2
<=> y=3/2 x-15/2 -3
<=> y= 3/2 x -15/2 -6/2
<=> y= 3/2 x - 21/2