<span><u><em>The correct answer is: </em></u> 1000.
<u><em>Explanation</em></u><span><u><em>: </em></u> We divide to find the answer to this: </span></span><span><span>. When we are dividing by 10, we can move the decimal to the left one place; doing this gives us 1000.</span></span>
So to start off you subtract y2 - y1/x2 - x1. This should look like -5 - -1/ -4 - -4. Now you do the math and you should get -4/0. Therefore the slope is undefined.
