1.

Prove that the points `(5,1), (1,-1)a n d (11 ,4)`are collinear. Also find the equation of the straight line on whichthese points lie.

Answer» Let A(5,1), B(1,-1) and C(11,4) be the given points. Then, `"Slope of AB"=((-1-1))/((1-5))=(-2)/(-4)=(1)/(2)`
`and "Slope of BC"=(4-(-1))/(11-1)=(5)/(10)=(1)/(2)`
`therefore` slope of AB=slope of BC
`Rightarrow AB|| BC` and have a point B in common
`Rightarrow A,B,C "are collinear"`


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