Splash Screen. Lesson Menu Five-Minute Check (over Lesson 2–7) CCSS Then/Now New Vocabulary Example 1:Solve for a Specific Variable Example 2: Solve for.

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Presentation transcript:

Splash Screen

Lesson Menu Five-Minute Check (over Lesson 2–7) CCSS Then/Now New Vocabulary Example 1:Solve for a Specific Variable Example 2: Solve for a Specific Variable Example 3:Real-World Example: Use Literal Equations Example 4:Use Dimensional Analysis

Over Lesson 2–7 5-Minute Check 6 A.32% decrease B.36% increase C.39% decrease D.40% increase Olivia’s cell phone bill last month was $125. This month her bill is $85. What is the percent of change?

CCSS Content Standards A.CED.4 Rearrange formulas to highlight a quantity of interest, using the same reasoning as in solving equations. A.REI.3 Solve linear equations and inequalities in one variable, including equations with coefficients represented by letters. Mathematical Practices 6 Attend to precision. Common Core State Standards © Copyright National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved.

Then/Now You solved equations with variables on each side. Solve equations for given variables. Use formulas to solve real-world problems.

Vocabulary literal equation dimensional analysis unit analysis

Example 1 Solve for a Specific Variable Solve 5b + 12c = 9 for b. 5b + 12c = 9Original equation 5b + 12c – 12c = 9 – 12cSubtract 12c from each side. 5b = 9 – 12cSimplify. Divide each side by 5. Simplify.

Example 1 Solve for a Specific Variable

Example 1 Solve 2x – 17y = 13 for y. A. B. C. D.y = 2x + 4

Example 3A Use Literal Equations Answer: Eg = m or m = Eg A. FUEL ECONOMY A car’s fuel economy E (miles per gallon) is given by the formula, where m is the number of miles driven and g is the number of gallons of fuel used. Solve the formula for m. Formula for fuel economy Multiply each side by g.

Example 3B B. FUEL ECONOMY If Quanah’s car has an average fuel consumption of 30 miles per gallon and she used 9.5 gallons, how far did she drive? Eg =mFormula for miles driven 30(9.5) =mE = 30 mpg and g = 9.5 gallons 285 =m Multiply. Answer: She drove 285 miles. Use Literal Equations

A. g = mE B. m = gE C.D. Example 3A A. FUEL ECONOMY A car’s fuel economy E (miles per gallon) is given by the formula, where m is the number of miles driven and g is the number of gallons of fuel used. Solve the formula for g.

Example 3B A.19 gallons B.1477 gallons C gallons D.80 gallons B. If Quanah drove 1477 miles and her pickup has an average fuel consumption of 19 miles per gallon, about how many gallons of fuel did she use?

Example 4 Use Dimensional Analysis CHIMPANZEES The average weight of the chimpanzees at a zoo is 52 kilograms. If 1 gram ≈ ounce, use dimensional analysis to find the average weight of a chimpanzee in pounds. (Hint: 1 lb = 16 oz) weight of chimpanzee kilograms to grams grams to ounces ounces to pounds 52 kg × × ×

52 kg × × ×= Example 4 Use Dimensional Analysis Notice how the units cancel, leaving the unit to which you are converting. Answer: The average weight of a chimpanzee is about 115 pounds.

Example 4 A.about 4.35 mi B.about 7 mi C.about 7.7 mi D.about 8 mi CHARITY Janet is walking 20 laps of a track in a relay to raise money for cancer research. If each lap is 350 meters, how many miles will Janet walk? (Hint: 1 meter  yards and 1 mile = 1760 yards)

End of the Lesson