Find the slope of the line passing through (-3, 7) and (6, -11)

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.

When y’all answer can y’all explain too !

1.two more than the quotient of a number and 6 is equal to 7 use the c for the unknown number translate the sentence into an equation