Which is the graph of x – y = 1

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters .

Rachel reads 1/5 of the pages of a book plus 12 pages on the first day. on the second day, she reads 1/4 of the remaining pages plus 15 pages. on the third day, she reads 1/3 of the remaining pages plus 18 pages. on the fourth day, she reads the remaining 70 pages. how many total pages are in the book?

Me because some of question i don’t understand