Kelly started with 90 dollars in her savings jar. Every week, Kelly spends 9 dollars from her savings jar at the grocery store. Represent this situation with a table, a graph, and an equation.

Question

Let’s start by representing this situation with a table. Start by finding the amount in the savings jar after 0, 1, 2 and 3 weeks.
Time in weeks Number of dollars in the savings jar
0
1
2
3

Answer 1

Time in weeks Number of dollars in the savings jar
0 90
1 81
2 72
3 63

Next, let's represent this situation with a graph. The x-axis will represent time in weeks, and the y-axis will represent the number of dollars in the savings jar.

Now, let's represent this situation with an equation. Let's define the amount in the savings jar after x weeks as S(x). Since Kelly spends 9 dollars from her savings jar every week, the equation for the amount in the savings jar after x weeks can be represented as:

S(x) = 90 - 9x

This equation represents the linear relationship between the number of weeks and the amount of money in Kelly's savings jar.