About the Parallel Line Calculator
Find the equation of the line parallel to y = mx + b that passes through a given point.
Also known as: parallel line equation, parallel slope, line parallel to another line.
How to use this calculator
- Enter slope of given line m, point x, point y.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Open “Step-by-step” to see how the answer was worked out.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
m₂ = m₁
Worked example
Using the values pre-filled in the calculator above:
- Slope of given line m = 2
- Point x = 1
- Point y = 4
the calculator returns:
- Equation: y = 2x + 2
- Slope: 2
Working
Parallel lines share the same slope.b = 4 − 2 × 1 = 2