Question

The value of k for which the lines 5x+7y=3 and 15x+ 21y=k coincide is

Answer 1

Answer:

1 is the answer 5/15,7/21 =1/3 Then what should be in the place of k so that value will be 1/3 if we put 1 answer will be 1/3

Answer 2

Answer:

k = 9

a1/a2=b1/b2=c1/c2 if the two lines are intersecting and have infinite solutions, so,

5x/15x=7y/21y=3/k

3/k=1/3

k=9