P1 = (3,3)
P2 = (2, 4)
x1 = 3 y1 = 3 x2 = 2 y2 = 4
1.- Find the slope
2.- Find the equation of the line
y - y1 = m(x - x1)
Substitution
y - 3 = -1(x - 3)
Simplification
y - 3 = -x + 3
y = -x + 3 + 3
Result
y = -x + 6
The equatin of the line is y = -x + 6