waecmaths question:
If $y-2x=4$and $y-3x=-1$, find the value of $(x-y)$
Option A:
3
Option B:
2
Option C:
1
Option D:
-1
waecmaths solution:
$\begin{align} & y+2x=4---(i) \\ & y-3x=-1---(ii) \\ & Subtract(ii)from\text{ }(i) \\ & 5x=5 \\ & x=1 \\ & \text{Substitute }1\text{ for }x\text{ in equation (}i\text{)} \\ & y+2(1)=4 \\ & y=2 \\ & (x,y)=(1,2) \\ & x-y=1-2=-1 \\\end{align}$
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