The Stop and Save sells oranges at a rate of 1.25 dollars per
orange.
1. What is the ratio of dollars to orange?
2. Jillian is only able to spend $9 on oranges. How many oranges
can she buy?
3. How much will it cost to buy 15 oranges?
4. ABC Grocery sells 6 oranges for $7.20. Compared to Stop and
Save is this a better buy? Justify your answer.

First set are parallel, second are perpendicular, third are perpendicular, fourth are neither.

*If you can't remember the rules, or want to check your answers, I would type them into a graphing calculator. It will easily tell you which category they're in. (desmos.com)*

Step-by-step explanation:

1. Same slope (6/5) = parallel

2. Reciprocal (flipped) slope, opposite signs

3. Reciprocal (flipped) slope, opposite signs

4. Neither, the slopes aren't the same or flipped

When you flip the slopes (3/4 becomes 4/3) and change a sign, the lines will always be perpendicular.

Hope it helps :)