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 pls ans fast urgent problem ....................
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If the system of equations 2x + 3y = 7 and (a+b)x + (2a-b)y = 21 has infinitely many solutions, then a) a = 1,
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