For what value of k, do the equations 2x – 3y + 10 = 0 and 3x + ky + 15 = 0 represent coincident lines
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2x – 3y + 10 = 0 – ( 1 )
a1 = 2
b1 = – 3
c1 = 10
3x + ky + 15 = 0 – ( 2 )
a2 = 3
b2 = k
c2 = 15
for coincident lines
a1/a2 = b1/b2 = c1/c2
2/3 = – 3/k = 10 / 15
2/3 = – 3/k = 2/3
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