Question

Which of the following points lie on the line joining the points (2,1) and (4,-1) ?

• A. (3,0)
• B. (2,2)
• C. (1,2)
• D. (1,1)

Answer 1

Answer:

C. (1,2)

Eqn of the line by

$\frac{y-y_1}{x-x_1}=\frac{y_2-y_1}{x_2-x_1}$

i.e, $\frac{y-1}{x-2}=\frac{-2}{2}$

$2y-2=-2x+4$

$2x+2y=6$

$x+y=3$

$1+2=3$