Formula
The slope multiplies x, then the intercept is added:
y = mx + b
The equation solver finds x in Ax + B = C. The slope page finds m from two points.
Assumptions
- The line is written in slope-intercept form.
- One x is evaluated.
Worked example
y = 2x + 1 at x = 4 is 9.
Input definitions
- Slope m
- The change in y for one unit of x.
- Intercept b
- The value of y when x is zero.
Limitations
Results are rounded for display. This is a classroom calculation, not a measurement from a lab or a financial filing.
Questions
How do I find the slope first?
Use the slope calculator with two points, then type that slope here.
Does this solve for x?
No. It calculates y for the x you enter.