Question

show that the points(1,5),(3,1), (4,-1) are collinear.

Answer 1

Answer:

let the three given points

A(1,5)

B(3,1)

C(4,-1)

now, the slope of AB =(1-5)/(3-1)= -2

again, the slope of BC =(-1-1)/(4-3)= -2

as the slope of AB = the slope of BC

therefore, they are collinear.