4.4.1: Solving Problems with Systems of Equations
- Page ID
- 36003
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Let's solve some gnarly problems.
Exercise \(\PageIndex{1}\): Are We There Yet?
A car is driving towards home at 0.5 miles per minute. If the car is 4 miles from home at \(t=0\), which of the following can represent the distance that the car has left to drive?
- \(0.5t\)
- \(4+0.5t\)
- \(4-0.5t\)
- \(4\cdot (0.5t)\)
___?
Solve each problem. Explain or show your reasoning.
- Two friends live 7 miles apart. One Saturday, the two friends set out on their bikes at 8 am and started riding towards each other. One rides at 0.2 miles per minute, and the other rides at 0.15 miles per minute. At what time will the two friends meet?
- Students are selling grapefruits and nuts for a fundraiser. The grapefruits cost $1 each and a bag of nuts cost $10 each. They sold 100 items and made $307. How many grapefruits did they sell?
- Jada earns $7 per hour mowing her neighbors’ lawns. Andre gets paid $5 per hour for the first hour of babysitting and $8 per hour for any additional hours he babysits. What is the number of hours they both can work so that they get paid the same amount?
- Pause here so your teacher can review your work. Then, invent another problem that is like one of these, but with different numbers. Solve your problem.
- Create a visual display that includes:
- Enough work space for someone to show a solution.
- The new problem you wrote, without the solution.
- Trade your display with another group, and solve each other's new problem. Make sure that you explain your solution carefully. Be prepared to share this solution with the class.
- When the group that got the problem you invented shares their solution, check that their answer is correct.
Are you ready for more?
On a different Saturday, two friends set out on bikes at 8:00 am and met up at 8:30 am. (The same two friends who live 7 miles apart.) If one was riding at 10 miles per hour, how fast was the other riding?