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What is the solution of (4x-y=11) and (x+y=4)?

Answer and explanation

Correct answer: (x=3,\ y=1)

The direct answer is option A: x=3 and y=1. A pair of linear equations is solved by finding values that satisfy both equations at the same time. Add 4x-y=11 and x+y=4. The terms -y and +y cancel, giving 5x=15, so x=3. Substitute this into x+y=4: 3+y=4, hence y=1. Check: 4(3)-1=11 and 3+1=4, so the answer is certain. Option A works because both equations are true. Option B, x=1,y=3, gives 4-3=1, not 11. Option C, x=4,y=0, gives 4x-y=16, not 11. Option D, x=2,y=2, gives 8-2=6, not 11. The useful exam cue is to add equations when opposite terms cancel directly; always substitute the result back to check.

Related tags

Linear EquationsEliminationSolution PairEasyClass 10

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