1. 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?

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

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

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

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

6. 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 of a degree per hour. How long, in hours and minutes, will it take for the temperature to decrease by 5 °F?

7. 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 °F each day. How many days did it take for the temperature to decrease by 9 °F?
−2𝑥=34 𝑦−3.5= 𝑧=−6