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y=2x+5==>>2x-y+5=0
gradien -->ax+by=c
adalah =-a/b
jadi 2x-y=5
gradien=m=-2/-1
krn tegak lurus
mk gradien =m1.m2=-1
-2/-1.m2=-1
m2=-1.1/-2=1/2
rumus pers A(2,5)
=y=m(x-x1)+y1
y=1/2(x-2)+5
y=1/2x-1+5
-2y= x-1+5
0=x+2y+4
jadi pers grs= x+2y+4=0