Rewrite the equation below in standard form. -3x+6y=12

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

What is the result of adding the system of equations? 2x+y=4 3x-y=6

Atransformation t : (x,y) (x-5,y +3) the image of a(2,-1) is