Solve using linear combination. y + x = –5y – x = 5,a) 0, 5 b) (–5, 0) c) (0, –5) d) (5, 0)

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

If you could answer these your a life saver

Cody ran nine miles on his first day of training. the next day he ran 1/8 that distance. how far did he run the second day?