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What is the solution of (5x+5y=25) and (x-y=1)?

Answer and explanation

Correct answer: (x=3,\ y=2)

The first equation has a common factor 5 in every term. Dividing the whole equation by 5 does not change its solutions, but it makes the calculation much easier. It becomes \(x+y=5\). The second equation is already simple. Adding these equations is useful because y and -y cancel, leaving only x.

Add \(x+y=5\) and \(x-y=1\): \(2x=6\), so \(x=3\). Put this value into \(x+y=5\): \(3+y=5\), giving \(y=2\). Checking the second equation gives \(3-2=1\), so the ordered pair is \((3,2)\). Thus option C is correct. Reducing the large coefficients first prevents unnecessary arithmetic and makes the elimination clear.

Related tags

Linear EquationsEliminationSimplificationEasyClass 10

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