Hello there!
To find the slope of a line, we need to know at least two points contained in the graph of the line.
The slope
of a line passing through the points
and
is given by the formula:
.
As we can see on the graph, two points contained on the line are
and
.
Using the formula above, we get that:
Subtract the values on both numerator and denominator of the fraction
This is the slope of this line we were looking for.