k : y + 6x + 5 = 0
y = - 6 x - 5
a = - 6
l: ( m - 3 ) x + y + 1 = 0
y = - ( m - 3 ) - 1
a ₁ = - ( m - 3 )
a = a ₁
- 6 = - ( m - 3 ) / : ( - 1 )
6 = m - 3
m - 3 = 6
m = 6 + 3
m = 9
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k : y + 6x + 5 = 0
y = - 6 x - 5
a = - 6
l: ( m - 3 ) x + y + 1 = 0
y = - ( m - 3 ) - 1
a ₁ = - ( m - 3 )
a = a ₁
- 6 = - ( m - 3 ) / : ( - 1 )
6 = m - 3
m - 3 = 6
m = 6 + 3
m = 9