Question

find the value of 'x' if the ponts (x,-1),(2,-1)and (4,5) are collinear.

Answer 1

If three points are collinear, then slope of line joining any two points is equal to slope of line joining other two points. Ans: x=2 Slope of line joining (x,-1) and (4,5) = slope of line joining (2,-1) and (4,5)_____________________ (x-4)/(-1-5)=(2-4)/(-1-5)____________________ On solving, x=2