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If (x+2y=20) and (x-y=2), what are the values of (x) and (y)?

Answer and explanation

Correct answer: (x=8,\ y=6)

The direct answer is option A: x=8 and y=6. Start with the simpler equation x-y=2. Add y to both sides, so x=y+2. Substitute this into x+2y=20: (y+2)+2y=20, hence 3y+2=20, 3y=18, and y=6. Therefore x=6+2=8. Checking gives 8+2(6)=20 and 8-6=2, so the pair is correct. Option A works because both equations are satisfied. Option B, x=6 and y=8, gives 6-8=-2, not 2, so it is wrong. Option C, x=10 and y=5, gives 10+10=20 but 10-5=5, so only one equation works. Option D, x=7 and y=7, gives 7-7=0 and 7+14=21, so neither equation is satisfied. Memory cue: isolate one variable, substitute, then check both original equations.

Related tags

Linear EquationsSubstitutionSolution PairEasyClass 10

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