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m2=-1per4/7=-1x7/4=-7/4
y-b=m(x-a)
y-5=-7/4(x+1)
y-5=-7/4x-7/4 dikalikan 4
4y-20=-7x-7
4y-20+7+7x=0
4y-13+7x=0
7x+4y-13=0
selesai :))