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Exemplo 3.56 de Elementary Algebra, 3.6 Solve Applications with Linear Inequalities
Problema e solução em inglês, como no livro original.
Sergio and Lizeth have a very tight vacation budget. They plan to rent a car from a company that charges $75 a week plus $0.25 a mile. How many miles can they travel and still keep within their $200 budget?
Resolva no papel primeiro. Depois abra a solução um passo de cada vez e pare assim que conseguir terminar sozinho.
| Step 1. Read the problem. | |
| Step 2. Identify what we are looking for. | the number of miles Sergio and Lizeth can travel |
| Step 3. Name what we are looking for.
Choose a variable to represent that quantity. |
Let the number of miles. |
| Step 4. Translate. Write a sentence that gives the information to find it. Translate into an inequality. |
$75 plus 0.25 times the number of miles is less than or equal to $200. |
| Step 5. Solve the inequality. | |
| Step 6. Check the answer in the problem and make sure it makes sense.
Yes, . |
|
| Step 7. Write a sentence that answers the question. | Sergio and Lizeth can travel 500 miles and still stay on budget. |
O Try It do livro logo depois deste exemplo: mesma ideia, outros números. Só a resposta é dada.
Taleisha’s phone plan costs her $28.80 a month plus $0.20 per text message. How many text messages can she use and keep her monthly phone bill no more than $50?
Como foi?