Question 12

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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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