Question

If the system of equations 2x + 3y = 7 and, (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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Answer 1

Answer:

a=5 b=the equations given has infinitely many solutions .