Problem of the Day This equation shows how the total cost of a members-only speaker series is related to the number of events attended. c = a + 18 The variable a represents the number of events attended, and the variable c represents the total cost. What is the maximum number of events someone can attend for a total cost of $19?

Solving One-step equations How do you use one-step equations with coefficients to solve problems?

Inverse Operations Opposite operations Addition is the opposite of subtraction Division is the opposite of multiplication And vice versa.

One-Step Equations In groups… 𝑥+3.2=−8.5 − 2 3 +𝑦=8 𝑥+3.2=−8.5 − 2 3 +𝑦=8 30=−0.5𝑎 − 𝑎 3.5 =9.2

More Practice… 4.9+𝑧=−9 𝑟−17.1=−4.8 −3𝑐=36

Write an Equation & Solve An airplane descends 1.5 miles to an elevation of 5.25 miles. Find the elevation of the plane before its descent. Between the hours of 10 P.M. and 6 A.M., the temperature decreases an average of 3 4 of a degree per hour. How long, in hours and minutes, will it take for the temperature to decrease by 5 °F?

Independently −2𝑥=34 𝑦−3.5=2.1 2 3 𝑧=−6 Suppose that during one period of extreme cold, the average daily temperature decreased 1 1 2 °F each day. How many days did it take for the temperature to decrease by 9 °F? −2𝑥=34 𝑦−3.5=2.1 2 3 𝑧=−6