If the system of equations 2x+3y=7,\ ...

If the system of equations `2x+3y=7,\ \ \ \ (a+b)x+(2a-b)y=21` has infinitely many solutions, then `a=1,\ \ b=5` (b) `a=5,\ \ b=1` (c) `a=-1,\ \ b=5` (d) `a=5,\ \ b=-1`

A

a = 1, b = 5

B

a = 5, b =1

C

a = -1, b = 5

D

a = 5, b = -1

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The correct Answer is:

B

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