There are at least 15 students in the class. translation for math algebra

Which graph shows a function with a range of all real numbers greater than or equal to -1

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?