There are two ways to approach this.
Option #1:
Use the slope formula
.

That value is undefined, so the slope is undefined.
Option #2:
Because the two points have the same x-value, they will be vertically above/below one another. This means your line is a vertical line and the slope of a vertical line is undefined.
Either way, your slope is undefined.
Answer:
The top one is right
Step-by-step explanation:
Because mp3 has to have the most while none has to have the least
Answer: (9,-10) or x=9...y=-10
10 * 10= 100
7*7=49
the ratio is 100:49
remember to mark me brainliest