4x+3y+7=0
3y=-4x-7
y=-⁴/₃x-⁷/₃
a=-⁴/₃
x+my+9=0
my=-x-9
y=-x/m -9/m
y=-1/m*x -9/m
-1/m=-⁴/₃/:(-1)
1/m=⁴/₃ /*m
1=⁴/₃m /:⁴/₃
m=1:⁴/₃
m=¾
...........
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4x+3y+7=0
3y=-4x-7
y=-⁴/₃x-⁷/₃
a=-⁴/₃
x+my+9=0
my=-x-9
y=-x/m -9/m
y=-1/m*x -9/m
-1/m=-⁴/₃/:(-1)
1/m=⁴/₃ /*m
1=⁴/₃m /:⁴/₃
m=1:⁴/₃
m=¾
...........