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If (y=x+5) and (x+y=17), which is the correct solution?

Answer and explanation

Correct answer: (x=6,\ y=11)

The correct solution is x=6 and y=11, so option B is correct. Start with y=x+5 and substitute it into x+y=17: x+(x+5)=17. Therefore 2x+5=17, 2x=12, and x=6. Now put x=6 into the first relation: y=6+5=11. Check: 11=6+5 and 6+11=17. Option A, (5,12), has the correct sum 17 but does not satisfy y=x+5, because 12 is 1 more than 5, not 5 more. Option B, (6,11), satisfies both equations. Option C, (7,10), has sum 17 but y is only 3 more than x. Option D, (8,9), has sum 17 but y is only 1 more than x. A useful check is to test both the difference and the sum, not just one equation.

Related tags

Linear EquationsSubstitutionSolution PairEasyClass 10

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