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You cannot.

You need four coordinates (two horizontal and two vertical) to uniquely identify two points. Having identified the two points, you can determine the slope (or gradient) as

[difference in vertical coords]/[difference in horizontal coords]

Then use this slope (m) and either of the two points in the equation y = mx + c to determine the value of c.

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Q: How can you get a linear equation from 3 coordinates?
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