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y-2/-1-2=x+2/4+2
y-2/-3=x+2/6
(y-2)(6)=(x+2)(-3)
6y-12=-3x-6
6y=-3x-6+12
6y=-3x+6
y=-3x+6/6
y=-3/6x+6/6
maka m=-3/6
b. y-y1/y2-y1=x-x1/x2-x1
y+5/5+5=x-0/-20-0
y+5/10=×-0/-20
(y+5)(-20)=(x-0)(10)
-20y-100=10x-0
-20y=10x-0+100
-20y=10x+100
y=10x+100/-20
y=10/-20x+100/-20
y=10/-20x-5
maka m=10/-20