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The slope of a line is found as follows of the two points (-5,-18)(-9,-19).
(y - y)/(x - x)
so let's take the first y (-18) and subtract the second y(-19).
It'll look like this: -18 - (-19) When you have two negatives sign together it makes a positive. (+)
So this will be -18 + 19 = 1
Now, let's look at the x's.
-5 - (-9) = +4
The slope is 1/4
Just as a note you could start with with the other y first -19 - (-18) = -1
And use the same pattern with x's. -9 -(-5) = -4
That gives us -1/-4 but when you have two negatives it turns positive and we come up with the same answer 1/4