Which following is not a function

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

What is the missing reason in step 5? linear pair postulategivendefinition of complementary anglescongruent complements theorem

3x + 4y = 5 x- 3y = -7 solve by substitution