Josie currently has $13 and plans to save an additional $7 each week to buy a jacket. She made a table showing the total amount of money she will have saved for different weeks.

Number of weeks 0 3 5 7

Total amount of money ($) 13 34 48 62 Write an equation in standard form that represents the relationship between the number of weeks and the total amount of money Josie will have saved.

x-7y=13

x+7y=13

-7x+y=13

7x+y=13

Currently, at week 0, Josie has $13. For every week that passes by, an additional $7 is added to the savings. For the week 3, a span of three weeks have passed, thus Josie save $21. Thus for week 3, the total savings is 34 (that is $13 + $21). And so on. Thus we see a pattern:

$13 + ($7 * number of weeks) = Total amount of money

Let y = number of weeks and x = total amount of money,

13 + 7y = x

This could be rearranged by transposing. Thus, the answer is, x-7y=13