Which of these steps will eliminate a variable in this system
3x-3y=6
6x+9y=3

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

Triangle knm is what is true about the sides of knm

Using inductive reasoning, what are the next two number in this set? 2,3/2,4/3,5/4,