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Question
If (5, 7), (3, p) and (6, 6) are collinear, then the value of p is
Options
3
6
9
12
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Solution
9
Explanation;
Hint:
Since the three points are collinear.
Area of a triangle is 0
5p + 18 + 42 – (21 + 6p + 30) = 0
5p + 60 – (51 + 6p) = 0
5p + 60 – 51 – 6p = 0
– p + 9 = 0
– p = – 9
p = 9
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