What is the value of p if the gradient of the line joining (-1,p) and (p, 4) is
?
| 3 |
?
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Correct Answer: Option D
Explanation:
=
4-p
p-(-1)
[/table]
=
4-p
p+1
[/table]
3(4-p) = 2(p+1)
12 - 3p = 2p + 2
12 – 2 = 2p + 3p
10 = 5p
= 2
| x2 - x1 |
| 3 |
=
4-p
[/table]
| 3 |
=
4-p
[/table]
3(4-p) = 2(p+1)
12 - 3p = 2p + 2
12 – 2 = 2p + 3p
10 = 5p
| 5 |
= 2