Use Linear Models to Solve Problems Practice Test

A bakery models the total cost of cupcakes as $y=2.25x+6$, where $y$ is total cost (dollars) and $x$ is the number of cupcakes. How many cupcakes can be bought for $\$24$?

A streaming service charges according to the model $y = 4x + 10$, where $y$ is the total cost in dollars and $x$ is the number of months. According to the model, how many months does it take for the total cost to reach $42?