If I am given a regression equation (with no data) how do I show the scatter plot graph on a TI-83?
The actual question is match the regression equation y=0.00115x+2.93 with the graph. I know which way it slopes but I don't understand where it crosses the y-intercept as my pictures of graphs don't make it clear.
You should rememeber that a graph intercepts y axis at x = 0, hence, you need to substitute 0 for x in the given equation of the function such that:
`y=0.00115*0+2.93 => y = 2.93`
Hence, the graph intercepts y axis at `(0,2.93).`
You also should find the x intercept substituting 0 for y in equation of the function such that:
`0=0.00115x+2.93 => 0.00115x = -2.93 => x =-2.93/0.00115`
`x = -2547.8260`
Hence, the graph intercepts x axis at `(-2547.8260,0).`
Hence, evaluating y and x intercepts yields (0,2.93) and (-2547.8260,0).