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pers gars melalui titik (x1,y1)
y-y1=m(x-x1)
pers grs yg melalui (x1,y1) dan (x2,y2)
y-y1/y2-y1=x-x1/x2-x1
grs melalui (a,b) sjajar Ax+By=C
Ax+By=Aa+Bb
kalo sejajar m1=m2
kalo yg tegak lurus
persamaanya Bx-Ay=Ba-Ab
m1xm2=-1