Geometry using slope.
What is the slope of (5,-6)
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Being that you only have a single point represented by (5,-6) there are an infinite number of lines that can pass through that point and since each line has an associated slope then there are an infinite number of slopes for the point (5,-6).
Hope this helps.
You need two points to determine the slope of a line. It's probably difficult to solve, because you don't have all the information you need to solve it.