Question 40

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waecmaths question: 

x

0

2

4

6

y

1

2

3

4

 

The table is for the relation y =mx + c where m and c are constants. Use it to answer 39 to 40

What is the value x when y = 5

Option A: 

8

Option B: 

9

Option C: 

10

Option D: 

11

waecmaths solution: 

$\begin{align}  & y=\tfrac{1}{2}x+1 \\ & \text{when }y=5 \\ & 5=\tfrac{1}{2}x+1 \\ & \tfrac{1}{2}x=4 \\ & x=8 \\\end{align}$

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