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6.3 Equations of Line of Best Fit


A set of two variables are related non linearly can be converted to a linear equation.  The line of best fit can be written in the form

Y = mX + c

where
X and Y are in terms of x and/or y
m is the gradient,
c is the Y-intercept

Recall: To find equation of straight line
(1)  Equation of a straight line if gradient (m) and one points ( x 1 , y 1 ) are given:
Y − y 1 = m ( X − x 1 )
(2)  Equation of a straight line if gradient (m) and y-intercept (c) are given:
Y = m X + c

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