Finding start and end points on a trendline

[datadummy]

I have a graph with a trend line and am wondering how can I determine what the start and end points of the trend line are?

 

[shg]

Click on the points at either end to see the coordinate values.

Or display the trendline equation to see the parameters and solve for y at xmin and xmax

Or use LINEST:

	A​	B​	C​	D​	E​	F​
1​	m​	b​
2​	-1​	6​				A2:B2: {=LINEST(B5:B7, A5:A7)}
3​
4​	x​	y​
5​	2​	3​		ybeg​	4​	E5: =A5*$A$2 + $B$2
6​	3​	5​		​
7​	4​	1​		yend​	2​	E7: =A7*$A$2 + $B$2

 

[datadummy]

Click on the points at either end to see the coordinate values.

Or display the trendline equation to see the parameters and solve for y at xmin and xmax

Or use LINEST:

	A​	B​	C​	D​	E​	F​
1​	m​	b​
2​	-1​	6​				A2:B2: {=LINEST(B5:B7, A5:A7)}
3​
4​	x​	y​
5​	2​	3​		ybeg​	4​	E5: =A5*$A$2 + $B$2
6​	3​	5​
7​	4​	1​		yend​	2​	E7: =A7*$A$2 + $B$2

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I've clicked on the trend line and no values are showing. So in your example I'm assuming the -1 and the 6 are your trend line values and if so how did you find them?

 

[shg]

The -1 is the slope and the 6 is the intercept. I used those values in the formulas in E5 and E7 to give the y coordinates of the endpoints; the x coordinates of those points are in A5 and A7.

 

[datadummy]

A couple questions, when you said "click on the points at either end to see the coordinate values" were you talking about the trend line or the data series line? Also how did you determine the slope and intercept? I have displayed the equation on the chart and am not sure what that data is telling me.

 

[shg]

when you said "click on the points at either end to see the coordinate values" were you talking about the trend line or the data series line?

The trendline.

I have displayed the equation on the chart and am not sure what that data is telling me.

The equation of a linear trendline is y=mx + b, where m is the slope and b is the point where the line intersects the y axis (the "y intercept")