Sam's taking a pen from his case. he has 1 black ,2 purple ,4 blue, and 3 red pens. if he chooses one without looking, what's the probability that he'll choose a blue one

Probablity=desiredoutcomes/totalpossibleoutcomes
total possible outcomes=1+2+4+3=10
desired outcomes=4 blue

probablity=4/10=2/5=40%

The answer would he -4,-2 because the points are just on the opposite side. since the x axis is +4 it's going to he -4 and since the y axis is -2 it stays there because whaen rotated it stays in the third quadrant