Analysis: For the given system, tell which equation you would first use to solve for a variable in the first step of the substitution method. Explain your choice.
2.5x – 7y = 7.5
6.2 - y = 1

Divide. reduce the answer to lowest terms.5 2/3 ÷ 3 1/9

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

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