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What is the solution of (4x-5y=2) and (x+y=5)?

Answer and explanation

Correct answer: ( (3,2) )

The direct answer is option D: \((x,y)=(3,2)\). From \(x+y=5\), write \(x=5-y\). Substitute into \(4x-5y=2\): \(4(5-y)-5y=2\). Expand: \(20-4y-5y=2\), so \(20-9y=2\), \(-9y=-18\), and \(y=2\). Therefore \(x=5-2=3\). Option A, \((4,1)\), gives \(4(4)-5(1)=11\), not 2. Option B, \((2,3)\), gives \(8-15=-7\). Option C, \((5,0)\), gives 20. Option D gives \(4(3)-5(2)=12-10=2\) and also has sum 5, so it is correct. The main danger is forgetting that the negative sign applies to both terms after substitution.

Related tags

Linear EquationsSubstitutionMediumClass 10

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