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m=-3/2
b. 6x-4y=7
-4y=-6x+7
y=-6/-4x+7/-4
m=-6/-4=3/2
c.m=y2-y1/x2-x1 (5,-1)(2,1)
m=1-(-1)/2-5=-2/3
d.(3,6)(1,3)
m=3-6/1-3=-3/-2=3/2
garis sejajar m1=m2
garis bdan d