Find intersection point given a line segment

Hi I have the given image of a curve where the two points (blue crosses) are joint with a line and would like to know where this line would cross the x axis (see green line and point in blue circle).

Thanks in advance

Answer 1

[Star Strider]

Since it appears to be a linear regression, defined as:

y = slope * x + y_intercept;

the x-axis intercept (where y=0) would be:

x_intercept = -y_intercept / slope;

If you want to know where it intersects y=0.2,

x_intercept = (0.2 - y_intercept) / slope;

[bram Vermeulen]

I don't understand this. I have a similar problem as OP but you will still need the y_intercept value to calculate x_intercept. How do you get this when you don't know y_intercept either.

[Star Strider]

Both the slope and y-intercept are required. If you have the data, or at least two (x,y) points defining the line, you can calculate both the slope and y-intercept easily. The rest is straightforward.

Answer 2

[Giorgis]

Thanks (once more!)

[Star Strider]

As always, my pleasure!