Given the system of equations One-third x minus two-thirds y = 7 and two-thirds x + 3 y = 11, which numbers can be multiplied by the equations to eliminate the x-variable? Check all that apply. –6 times the first and 3 times the second
6 times the first and –3 times the second
–3 times the first and 6 times the second
3 times the first and –6 times the second
2 times the first and –1 times the second

If x + 10 = 70, what is x? a. 40 b. 50 c. 60 d. 70 e. 80

Simplify the expression. -2/5(10+15m-20n)

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