Slope-intercept form calculator
Fill in what you know and leave the unknown box empty — it works out whichever one is missing. Nothing is uploaded; the arithmetic happens in your browser.
The formula
y = mx + b
Where this usually goes wrong
b is where the line crosses the y-axis — the value of y when x is zero.
Worked example
With slope 2 and intercept 1, x = 3 gives y = 7.
Those numbers are already in the boxes above — press Work it out to see it, then change them for your own.
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