waecmaths question:
If $x+y=2y-x+1=5$ , find the value of x
Option A:
3
Option B:
2
Option C:
1
Option D:
–1
waecmaths solution:
$\begin{align} & x+y=2y-x+1=5 \\ & x+y=5---(i) \\ & -x+2y+1=5---(ii) \\ & -x+2y=4----(ii) \\ & \text{Add (i) and (ii) together} \\ & 3y=9 \\ & y=3 \\ & \text{From (i) }x=2 \\\end{align}$
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