Q5 of 110 Page 269

Find the value of k for which the
points A(1, -1), B(2, k) and C(4, 5) are collinear.


Since they are collinear, the area will be 0


→


Expanding with C3


→ 0 = (10-4k)-(5+4)+(k+2)


→ 0=-3k+3


→ 3k=3


∴ k= 1


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