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=-1/1=-1
b.m=-x/y
=-4/5
c.m=-x/y
=-2/-6
=1/3
a=1, b=1, c=-10
m=-a/b
m=-(1/1)
m=-1
b) 4x+5y=9
4x+5y-9=0
a=4, b=5, c=9
m=-a/b
m=-(4/5)
m=-4/5
c) 2y-6x+1=0
-6x+2y+1=0
a=-6, b=2, c=1
m=-a/b
m=-(-6/2)
m=3
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