Dora is keeping track of the number of books she has read during the current school year. she has already read 4 books.
which equation shows the total number of books, y, dora will have read by the end of the school year?
a. y = 4x, where x represents the number of books dora has already read
b. y = x + 4, where x represents the number of books dora has already read
c. y = 4x, where x represents the number of books dora reads between now and the end of the year
d. y = x + 4, where x represents the number of books dora reads between now and the end of the year