Equation+for+Line+of+Best+Fit

=To come up with the equation for the line: =

=1. Where does the line of Best Fit intersect the //y//-axis? Let's represent that number as b. =

=2. Pick a point on the line of Best Fit. What are the x, y coordinates for that point? =

=3. Plug in your values for //b, x,// and //y// into the formula for a linear equation in the form of y=mx+b = = = =4. Solve for //m//. This is your slope. =

=Lets try it using the graph on the previous page. = = = =The //y// - intercept is 16. Therefore //b// =16 = =A point on the line has the coordinates (1.5,40) = =Plugging these values into the formula we get 40=m(1.5)+16 = =Then solving for //m//, we get 16 = = = =We now can rewrite the formula as //y=//24//x+//16//.// This equation is refered to as the slope - intercept = =How can we check if this equation is right? =

=After you have checked your equation, continue to the next step ===> =