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M=
4x+2y+5=0
m=
2.2x-3y+4=0
m=
2y = -4x - 5
y = -4/2x - 5/2
m = -4/2
____________________
2x - 3y + 4 = 0
-3y = -2x - 4
y = -2/-3x - 4/-3
y = 2/3x + 4/3
m = 2/3