Explain why (4, 1) is not the solution to the equation= 3x+1.

Question 5 spring semester final exam math evaluate

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

Can someone me with the property questions for 12 13 and 14 plz