Marcus currently has $42 and has plans to save an additional $5 each week to buy a pair of shoes. he made a table showing the total amount of money he will have saved for different weeks.

number of weeks: 0 2 5 8
total amount of money: 42 52 67 82

write an equation in standard form that represents the relationship between the number of weeks and the total amount of money marcus will save.

a. -5x + y = 42
b. -x + 5y = 42
c. x + 5y = 42
d. 5x + y = 42