Question

Find the equation of the line joining $(1,2)$ and $(3,6)$.

Answer 1

Line passing through $(1,2)$ & $(3,6)$

$(x_1,y_1)=(1,2)(x_2,y_2)=(3,6)$

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

$y-2=\frac{y}{2}(x-1)$

$y-2=2(x-1)$

$y-2=2x-2$

$2x=y$

$2x-y=0$