Please help me out with this

Solve for x, y, and z. show all steps.

Shryia read a 481 -page-long book cover to cover in a single session, at a constant rate. after reading for 1.5 hours, she had 403 pages left to read. how fast was shryia reading? pages per hour how long did it take her to read the entire book? hours plz i realy need this

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15