Reference Line in Scatter Plot

[luke3]

Hi, I want to put a reference line in a scatter plot.
A reference line called Y=5 can be easily inserted, but how should I insert the reference line Y=5*pow(10,2)*X?

I tried to draw using the value (xaxis) used for the x-axis of the graph, but nothing was displayed.
Is the reference line only a straight line?

[ogster1974]

Yes it is although there are regression lines available.