Question

show that P(3,1),Q(-1,9) and R(4,-1) are collinear ​

Answer 1

Answer:

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Answer 2

Answer:

slope of PQ =

$\frac{9 - 1}{ - 1 - 3} = \frac{8}{ - 4} = - 2$

slope of QR =

$\frac{ - 1 - 9}{4 + 1} = \frac{ - 10}{5} = - 2$

i.e slope of PQ = slope of QR

hence collinear. Proved