Suppose you have $55 in your bank account. you start saving $10 each week. your friend has $20 in her account and is saving $15 each week. when will you and your friend have the same amount of money in your accounts? a. 6 weeks b. 8 weeks c. 7 weeks d. 5 weeks

$ you have will be represented by y
$ your friend has will be f
The amount of weeks you save up for will be w
y=55+10w
f=20+15w
now set them equal to each other
55+10w=20+15w
Move all variables to one side and all constants to the other
55-20=15w-10w
combine like terms
35=5w
isolate the variable
35/5=w
combine like terms
7=w
it will take 7 weeks