Question

Equation of the line passing through the points (1,-1) and (3,5) :

• A. 4x-y+5 =0
• B. 4x+y+5 =0
• C. 3x-y-4=0
• D. 2x-y-5 =0

Answer 1

Answer:

C. 3x-y-4=0

Eqn of the line by

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

$\frac{y+1}{x-1}=\frac{5+1}{3-1}$

$\frac{y+1}{x-1}=\frac{6}{2}$

$(y+1)=3(x-1)$

$3x-3=(y+1)$

$3x-y-4=0$