Question 1142984
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The math will be more interesting to you if you understand it, rather than solving problems by plugging numbers into formulas.  Try solving this problem using a basic understanding of slope.<br>
A slope of 2 means you go up 2 units for every 1 unit you move to the right.  See how far you move to the right and up or down to get from the given point (0,-1) to each of the answer choice points.<br>
(0,-1) to (2,1): right 2, up 2.  NOPE! With a slope of 2, right 2 would have to be up 4.<br>
(0,-1) to (1,1): right 1, up 2.  YES!  That is what we need with a slope of 2.<br>
(0,-1) to (0,1): right 0, up 2.  In this case, we haven't moved right at all, so the slope is undefined.