Please help! the subject is functions (math) (the picture is below)

If you shift the linear parent function, f(x)=x, up 13 units, what is the equation of the new function?

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

Give me the equations of two lines that have the same slope but are not parallel.