In a trendline based on 4 observations if the Y average is 80 and slope is 28 the the intercept is?

Answer 1

Regression line equation: y^=mx^+b

80=28(x^)+b

You need to determine the x^ from the 4 coordinate pairs... which is just the average of all the x-ordinates. Once you have the x^, substitute inside the equation and you can calculate the b.

You may find it easy to understand if you draw the chart. Hope this helps in some way.