Looking at the line you can see that it is moving up from left to right, making it positive. So -2X and -12X are incorrect.
Next we can find the slope by putting rise over run. Chose a point on the line, I’ll use (2,4). On this point we rise to 4 and run over to 2. So for rise over run we have 4/2 which is 2. So y=2x is correct.
