Given two points (1, -1) (3,5)
x1 = 1 y1 = -1
x2 = 3 y2 = 5
y - y1 = y2 - y1 (x-x1)
x2 - x1
Substitute the values:
y - -1 = 5 - -1 (x - 1)
3 - 1
y+1 = 5+1 (x-1)
2
y = 6/2(x-1) -1
y = 3(x-1)-1
y = 3x -3 - 1
y = 3x - 4 , slope-intercept form
Equation in Standard for, ax + by = c
3x - y = 4
Equation in general form, ax + by +c = 0
3x - y - 4 = 0