Question

What is the equation of the blue line (MathsWatch)

Answer 1

Line passes though points (-1 , 0) and (0 , -1).

Equation of line in two point form :

• $\sf{(y - y_1) = \dfrac{y_2 - y_1}{x_2 - x_1}(x - x_1)}$

• $\sf{(y - (-1)) = \dfrac{0 - (-1)}{-1 - 0}(x -0)}$

• $\sf{y + 1 = \dfrac{1}{-1}(x)}$

• $\sf{y + 1 = -x }$

• $\sf{x+y + 1 =0 }$

• $\sf{y = -x - 1 }$