Lesson 3.1 Evaluate Linear Expression

This lesson will help you use linear expressions to represent problems with one variable. KEY CONCEPTThere are a lot of unknowns around us. In math we do not always know the total we are solving for or the values we are calculating. These are expressions. Evaluating linear expressions means substituting values (numbers) for variables (letters). CONCEPT SKILLS PRACTICES• Perform Operations• Evaluate Expressions 1. A wedding hall charges $10 per person for food and $4 per person for beverages. The rental fee for the wedding hall is $350. Using p=people, which of the following represents the total cost for the wedding hall? 350+10p-4p 350-10p-4p 350+10p+4p 350-10p+4p 2. An airplane is 50,000 feet when it starts to descend to the ground at the rate of 10 feet per second. Using t=time in seconds, choose the expression that represents the plane's descent. 50,000-10t 50,000+10t 10t-50,000 50,000X10t 3. Let w=width of a garden. The length of the rectangular garden is four times its width, minus 5. What is an expression for the perimeter of the garden? 4w-5+w 2(4w-5)+2w