Question

Mcq :
the pairs of equation ax +3y =9 and 3x +By =17 represent parallel lines if
a) a= b
b) 3a=3b
c) ab=9
d) none of these .
please give right answers
i will respond to every answer so plzz be fast !!!​

Answer 1

Step-by-step explanation:

pair of equations represent parallel lines if a1/a2=b1/b2≠c1/c2

so here if these lines are parallel then..

a/3=3/b

=>ab=9

hence option c is correct.

Answer 2

Answer:

(c) ab = 9

Step-by-step explanation:

For parallel lines, a1/a2 = b1/b2 = c1/c2

a/3 = 3/b = 9/17

Since, a/3 = 3/ b

On further solving, we get

ab = 9

Therefore, option (c) is correct.

Hope it's help you.

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