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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) `a=1,\ \ b=5` (b) `a=5,\ \ b=1` (c) `a=-1,\ \ b=5` (d) `a=5,\ \ b=-1`

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RD SHARMA-PAIR OF LINEAR EQUATIONS IN TWO VARIABLES-All Questions
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