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If (3x+2y=25) and (x-y=1), what is the value of (x+y)?

Answer and explanation

Correct answer: (\frac{49}{5})

The direct answer is option C: 49/5. From x-y=1, add y to both sides to get x=y+1. Substitute into 3x+2y=25: 3(y+1)+2y=25, so 5y+3=25, 5y=22, and y=22/5. Then x=22/5+1=27/5. Therefore x+y=27/5+22/5=49/5. Option C is correct. Option A, 8, is not the calculated sum and does not come from the equations. Option B, 9, is also incorrect. Option D, 51/5, is different from the required numerator sum 27+22=49. A decimal check gives x=5.4,y=4.4, whose sum is 9.8=49/5; the original equations give 25 and 1. Keep denominators common when adding fractions, and do not confuse x+y with either variable alone.

Related tags

Linear-EquationsSubstitutionExpression-ValueMediumClass-10

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