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y=-3/4x+5/4
jadi gradien m1=-3/4
gradien m1 tegak lurus m2 maka m2=-1/m1
m2=-1/(-3/4)
m2=4/3
persmaan yg melalui titik (-1,2) adalah
(y-y1)=m(x-x1)
(y-2)=4/3(x-(-1))
3(y-2)=4(x+1)
3y-6=4x+4
3y=4x+4+6
3y=4x+10