Susan, chang, and henry sent a total of 127 text messages over their cell phones during the weekend. chang sent 3 times as many messages as henry. henry sent 7 fewer messages than susan. how many messages did they each send?

Write two subtraction equations that are equivalent to 5 + 12 = 17.

How do you use the elimination method for this question? explain, because i really want to understand!

Trent wants to buy 2 packs of trading cards for 3 dollars each. the trading card packs that trent normally buys tend to come in packs of 6, 10, 12, or 15 cards. after selecting 2 packs, trent found that the first pack of cards cost 25 cents per card, and the second pack cost 30 cents per card. trent uses this information to write the equations below in order to compare c, the number of cards in each pack.