Question

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4. For what value of a, the points (a, 1), (1, -1) and
(11, 4) are collinear ?

Answer 1

Step-by-step explanation:

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Answer 2

slope of AB = Slop OF BC

-1 - 1 ÷ 1 -a = 4 + 1 ÷ 11 - 1

-2 ÷ 1 - a = 5 ÷ 10

1 - a = - 4

a = 5