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m=y2-y1/x2-x1
m=-2-2/-4-(-7)
m=-4/3 tegak lurus menjadi 3/4
y-(-3)=3/4(x-(-3))
y+3=3/4(x+3)
y+3=3/4. x+9/4
y=3/4 x+9/4-3
y=3/4 x+9/4-12/4
y=3/4 x-3/4