Given two straight lines L1: MX - (2m-3) Y-1 = 0, L2: (2m + 5) x + (M + 6) Y-7 = 0, if L1 / / L2 find the value of M

Given two straight lines L1: MX - (2m-3) Y-1 = 0, L2: (2m + 5) x + (M + 6) Y-7 = 0, if L1 / / L2 find the value of M

This formula is general
For the parallel of general form
A1x+B1y+C1=0
A2x+B2y+C2=0
The key is
A1B2=A2B1
That's the question
m(m+6)=-(2m-3)(2m+5)
Simplification
m^2+2m-3=0
(m+3)(m-1)=0
M = - 3 or 1
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