Equation of a Straight Line Calculator
📈 Coordinates & graphs. Use the Equation of a straight line formula to find y, gradient m, x, y-intercept c: pick the value you want, type the others, and the answer updates as you go.
y11
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| y | no unit |
| Gradient m | no unit |
| x | no unit |
| y-intercept c | no unit |
Worked example
Find the y when Gradient m = 2, x = 4, y-intercept c = 3.
Using y = mx + c: y = 11.
Frequently asked questions
What is the formula for Equation of a straight line?
y = mx + c.
What do the letters stand for, and what units are used?
y, Gradient m, x, y-intercept c.
How do you calculate y?
Put the values into y = mx + c. For example, with Gradient m = 2, x = 4, y-intercept c = 3, y = 11.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (y, gradient m, x, y-intercept c) and fill in the others: it rearranges the formula for you.
