1. Problem Solving Using Systems of Linear Equations
Chapter 7 Section 4
Problem Solving Using Systems of Linear Equations

2. Essential Question
How do you use a systems of equations to solve application problems?

3. Practice
Kimo invests a total of $6000. He divides his investment amongst two companies: Menhune Water and Krispe Kreme. In the first year, he makes 8% on his Menhune Water investement, and 12% on Krispy Kreme. How much did he invest in each company if he made $620 in interest during this period?

4. Practice
Two trains leave Clevelend at the same time. One train travels east and the other travels west. The speed of the westbound train is 3 mph greater than the speed of the eastbound train. After 5 hours, they are 765 miles apart. Find the rate of each train. Assume the train travels in a straight line in opposite directions.

5. Practice
How many liters each of a 20% acid solution and a 45% acid solution must be used to produce 50 liters of a 25% acid solution?

6. Practice
Michelle decides to mix grades of gasoline in her truck. She puts in 11 gallons of regular and 8 gallons of premium for a total of $ If premium gasoline costs $0.19 more per gallon than regular, what was the price of each grade of gasoline?