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Joan has some photos in her photo album. Every 10 days she plans to add 12 photos. After 5 weeks, she has 120 photos.

- What does the variable "x" represent?
- What does the variable "y" represent?
- How many photos did she initially have in her photo album?

Answer :

Final answer:

The variable 'x' represents the number of intervals of 10 days. The variable 'y' represents the total number of photos. Joan initially had 78 photos in her photo album.


Explanation:

The variable 'x' represents the number of intervals of 10 days.

The variable 'y' represents the total number of photos.

To find the initial number of photos, we need to subtract the photos added in the 5 weeks from the total number of photos. Since Joan adds 12 photos every 10 days, she adds 12/10 = 1.2 photos per day. In 5 weeks, there are 5 * 7 = 35 days. Therefore, she adds 1.2 * 35 = 42 photos. So the initial number of photos is 120 - 42 = 78 photos.


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