Question

If the points (a,b), (1,1) and (2, 2)
are Collinear then
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Answer 1

let,

x1=a. x2=1. x3=2

y1=b. y2=1. y3=2

if the given points ar collinear then the slope of this line is same,

so,

(y2-y1)/(x2-x1)=(y3-y2)/(x3-x2)

(1-a) /(1-b) =(2-1)/(2-1)

1-a=1-b

a=b

so,

every point having a=b

is collinear