Question

Complete the equation of the line through (2,1)and (5,-8)

Answer 1

$m = \frac{ - 8 - 1}{5 - 2} \\ = \frac { - 9}{3} \\ m = - 3 \\ y = mx + c \\ 1 = - 3(2) + c \\ c = 7 \\ y = mx + c \\ y = - 3x + 7$