A = 9, B = - 1, C= 56
obtain the equation in ' slope-intercept form'
y = mx + c → ( m is the slope and c the y- intercept)
calculate m using the ' gradient formula'
m = (- 7 - 2)/(- 7 + 6) = (-9)/(-1) = 9
partial equation is y = 9x + c
to find c substitute either of the 2 points into the equation.
using (- 6, 2) then
2 = - 54 + c ⇒ c = 2 + 54 = 56
y = 9x + 56 → slope-intercept equation
subtract y from both sides
0 = 9x - y + 56 → general form
with A = 9, B = - 1, C = 56
