Question 7

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waecmaths question: 

Solve the equations$\begin{align}  & 3x-2y=7 \\ & x+2y=-3 \\\end{align}$

Option A: 

$x=1,y=-2$

Option B: 

$x=1,y=3$

Option C: 

$x=-2,y=-1$

Option D: 

$x=4,y=-3$

waecmaths solution: 

$\begin{align}  & 3x-2y=7---(i) \\ & x+2y=-3---(ii) \\ & \text{Add }(i)\text{ and }(ii) \\ & 4x=4 \\ & x=1 \\ & \text{substitute }1\text{ for }x\text{ into (i)} \\ & 3(1)-2y=7 \\ & -2y=4 \\ & y=-2 \\ & x=1,\text{ }y=-2 \\\end{align}$

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