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Question

x = 5, y = 2 is a solution of the linear equation

(a) x + 2y = 7

(b) 5x + 2y = 7

(c) x + y = 7

(d) 5x + y = 7

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Solution

Substituting the values x = 5, y = 2 in

(a) x+2y=7, we get

LHS=5+2×2=5+4=97=RHSi.e.LHSRHS

(b) 5x+2y=7, we get

LHS=5×5+2×2=25+4=297=RHSi.e.LHSRHS

(c) x+y=7, we get

LHS=5+2=7=RHSi.e.LHS=RHS

(d) 5x+y=7, we get

LHS=5×5+2=25+2=277=RHSi.e.LHSRHS

Hence, the correct option is (c).


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