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-21=3x-6
3x=-21+6
3x=-15
x=-5
2.garis m:2x+3y=-6
3y=-2x-6
y=(-2x-6)/3⇒m=-2/3
gsyarat gradien 2 grs yg slng tgk lurus adalah
m1xm2 =-1
-2/3xm2 =-1
m2=3/2
jd gradien gris n= 3/2
=3x=-21+6
=3x=-15
=x=-5