Help with simple ap 10th grade math problems? pleasee help me(:?

For 17 and 18, use the slope formula to find out the comparison of the two lines. If the slopes are -1, then the two lines are perpendicular. If the slopes are the same, then they are parallel. If you get a random number, then they are neither. For 19, divide 45 by 18, which turns out to be 2.5. Then, divide 24.75 by 9, which turns out to be 2.75. The first game is $2.50 per hole, and the second game is $2.75 per hole. The first game costs less per hole played.