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General Form of Equation of a Line

Ax + By + C = 0

A or B can be zero, but not both at the same time.

The General Form is not always the most useful form, and you may prefer to use:

The Slope-Intercept Form of the equation of a straight line:

y = mx + b

The Point-Slope Form of the equation of a straight line:

y - y₁ = m(x - x₁)

We are heading for

y = mx + b

And we are done! (Note: m=2 and b=5/2)

Why Use It?

It has the advantage of working well with vertical lines, which the Slope-Intercept Form and Point-Slope Form do not.