Is y=4x+2 proportional or non-proportional?

Volume of a cylinder with a radius of 13 in and height of 30 in

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

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