Question

The pair of linear equations 2x+7y=b,bx+21y=18 has infinetly many solutions b=3,b=6,b=9,b=18
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Answer 1

Answer:

collinear has infinitely many solutions...

a1/a2 =b1/b =c1/c2

2/b = 7/21 = -b/ -18

2/b = 1/3 = b/18

2/b =1/3

6=b

by substituting b value,

2/6 = 1/3 = 6/18

1/3 = 1/3= 1/3

so lines are collinear....

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