Ax + By + C = 0is the general form of the equation of a straight line

The following equations are in said to be in general form:

- x + 3y + 4 = 0
- 10x + 15y + 4 = 0
- x - 10y = 0 (here 'C' is zero)
- x + 3 = 0 (here 'B' is zero)
- 4y + 2 = 0 (here 'A' is zero)

The following equations are not in the general form:

- x + 3y = 4 (the number 4 should be on the left hand side)
- -x - 10y = 0 (x should not be negative)
- x + 3 + y = 0 (the correct order is x, then y then the number)

Some equations in the general form, with their graphs:

- x + 3y + 4 = 0
- 10x + 15y + 4 = 0

An equation written in the general form Ax + By + C = 0, has

- x-intercept = -C/A

- y-intercept = -C/B

- slope = -A/B