Math Calculators

Parallel Line Calculator

Find the equation of a line that passes through a given point and is parallel to a line of known slope.

Slope of parallel line —

y-intercept (b) —

Equation —

About the Parallel Line Calculator

Parallel lines never intersect because they share the exact same slope. To find a line parallel to a given one that passes through a specific point, keep the same slope and solve for the new y-intercept.

Formula: Parallel slope = m (unchanged) · b = y₁ − m × x₁

This is used in geometry proofs, engineering layouts and graphic design whenever a line must run alongside another without ever crossing it.