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Question

Find the value of x for which the points (x,1),(2,1) and (4,5) are collinear.

Solution
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If point A(x,1),B(2,1), and C(4,5) are collinear, then slope of AB = slope of BC
1(1)2x=5142
1+12x=42
22x=2
2=42x
2x=2
x=1

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