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m=-2
b. y=1/3 x + 2/5
m=1/3
3x+y=5
y=-3x+5
m=-3
garis yg tegak lurus m1.m2=-1
-3.m2=-1
m2=-1/(-3)
m2=1/3
jadi ygtegak lurus adalah "b"
y=1/3 x+2/5