Question

The points (2,1)(4,2) and(6,a) are collinear. find a

Answer 1

Answer:

Let the ratio be k : 1

2 = k×a+1×1/k+1

2(k+1) = ka+1

2k+2 = k×a +1

a = 3

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Answer 2

Answer:

a=3

Step-by-step explanation:

ar of Δ= 1/2 |x1(y2-y3)+x2(y3-y1)+x3(y1-y2)|