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#### Deskmate

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##### Obtaining The Equation Of Line Of Best Fit
« on: March 14, 2016, 12:17:47 PM »
If we have a straight line then we can calculate an equation for this line from the graph and then use this equation as a formula.

We need two things: the gradient of the line and the y-intercept, or we can work out the equation from two points on the line.

For the gradient we need to draw a right angled triangle onto the line of best fit and then work out a vertical side distance and a horizontal side distance. The gradient is the vertical distance divided by the horizontal distance.

The y-intercept is where the line of best fit (extended if needed) cuts through the vertical axis.

The material on graphs gives the details.
We're former students so we know what we are saying.... We have a bit of teachers too.

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