What is the value of p if the gradient of the line joining (-1,p) and (p, 4) is
| 2 |
| 3 |
?
- -2
- -1
- 1
-
2
The correct answer is: D
Explanation
| Gradient = | y2 - y1 |
| x2 - x1 |
| = | 4-p | ||
| p-(-1) |
| = | 4-p | ||
| p+1 |
3(4-p) = 2(p+1)
12 - 3p = 2p + 2
12 – 2 = 2p + 3p
10 = 5p
| p = | 10 |
| 5 |
= 2
There is an explanation video available .