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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