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Standard Form to Slope Intercept Form Calculator

Convert linear equations between standard form (Ax + By + C = 0) and slope-intercept form (y = mx + b) with step-by-step algebra.

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Standard Form vs Slope-Intercept Form

A linear equation can be written in standard form $Ax + By + C = 0$ or in slope-intercept form $y = mx + b$. Standard form is useful for systems of equations and geometry, while slope-intercept form makes the slope $m$ and y-intercept $b$ immediately visible. This calculator converts between both forms with step-by-step algebra.

For related tools, see the Equation of a Line Calculator and Slope Calculator.

Conversion Formulas

From standard form to slope-intercept (when $B \neq 0$):

$$y = -\frac{A}{B}x - \frac{C}{B}$$

So $m = -\frac{A}{B}$ and $b = -\frac{C}{B}$.

From slope-intercept to standard form:

$$mx - y + b = 0$$

Worked Example

Convert $2x - 3y + 6 = 0$ to slope-intercept form. Isolate $y$:

$$-3y = -2x - 6 \Rightarrow y = \frac{2}{3}x + 2$$

The slope is $\frac{2}{3}$ and the y-intercept is $2$.

Frequently Asked Questions

When does slope-intercept form not exist?

When $B = 0$ in standard form, the line is vertical ($x = -\frac{C}{A}$) and cannot be written as $y = mx + b$ because the slope is undefined.

Can I convert a horizontal line?

Yes. A horizontal line has $A = 0$, giving $y = -\frac{C}{B}$ with slope $m = 0$.

Are the two forms equivalent?

Yes. Every non-vertical line has a unique slope-intercept form and a corresponding standard form (up to a nonzero scalar multiple of all coefficients).

How do I check if two lines are parallel?

Compare slopes in slope-intercept form. Parallel lines have equal slopes. In standard form, parallel lines have proportional $A$ and $B$ coefficients.