Hi Anon;
Great question. You should be proud to ask it!
slope=(yy_{1})/(xx_{1})
It is the change of y, divided by the change of x. It is also called rise (up and down) over run (left and right).
slope=(37)/(12)
slope=4/3=4/3
A negative divided by a negative yields a positive number.
The answer is C.
10/23/2013

Vivian L.