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Writing Equations When writing equations, use variables to represent the unspecified numbers or measures referred to in the sentence or problem. Then.

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Presentation on theme: "Writing Equations When writing equations, use variables to represent the unspecified numbers or measures referred to in the sentence or problem. Then."— Presentation transcript:

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2 Writing Equations When writing equations, use variables to represent the unspecified numbers or measures referred to in the sentence or problem. Then write the verbal expressions as algebraic expressions. Writing equations

3 Writing Equations Some verbal expressions that suggest the equals sign are listed below: is equals is equal to is the same as is as much as is identical to Expressions for equals sign

4 Example 1-1a Translate this sentence into an equation. A number b divided by three is equal to six less than c. b divided by three is equal to six less than c. Answer: The equation is. Translate Sentences into Equations

5 Answer: The equation is. Example 1-1b Translate this sentence into an equation. Fifteen more than z times six is y times two minus eleven. 15z6y211 Translate Sentences into Equations

6 Answer: The equation is. Example 1-1c Translate each sentence into an equation. a.A number c multiplied by six is equal to two more than d. b.Three less than a number a divided by four is seven more than 3 times b. Translate Sentences into Equations

7 Writing Equations Explore the Problem : To solve a verbal problem, first read the problem carefully and explore what the problem is about. Identify what information is given. Identify what you are asked to find. Plan the Solution : One strategy you can use to solve a problem is to write an equation. Choose a variable to represent one of the unspecific numbers in the problem (defining a variable). Use the variable to write expressions for the other unspecified numbers in the problem. Estimate the answer if possible. Explore & Plan Using the four-step problem-solving plan can help you solve any word problem.

8 Solve : Use your strategy to solve the problem. If your plan does not work, revise it or make a new plan. Examine : Check your answer in the context of the original problem. Is your answer reasonable and close to your estimate? Does your answer make sense? Does it fit the information in the problem? If not, solve the problem another way. Solve & Examine Writing Equations

9 Example 1-2a ExploreYou know that 1,250,000 jellybeans are produced each hour. You want to know how many hours it will take to produce 10,000,000 jellybeans. Jellybeans A popular jellybean manufacturer produces 1,250,000 jellybeans per hour. How many hours does it take them to produce 10,000,000 jellybeans? Use the Four-Step Plan

10 Example 1-2b PlanWrite an equation to represent the situation. Let h represent the number of hours needed to produce the jellybeans. 1,2500,000 h 10,000,000 Solve Find h mentally by asking, “What number times 125 equals 1000?” Answer:It will take 8 hours to produce 10,000,000 jellybeans. 1,250,000 times hours equals 10,000,000. h = 8 Use the Four-Step Plan

11 Example 1-2c ExamineIf 1,250,000 jellybeans are produced in one hour, then 1,250,000 x 8 or 10,000,000 jellybeans are produced in 8 hours. The answer makes sense. Use the Four-Step Plan

12 Example 1-2d A person at the KeyTronic World Invitational Answer: It would take 24 minutes. Type-Off typed 148 words per minute. How many minutes would it take to type 3552 words? Use the Four-Step Plan Let m = the number of minutes needed to type 3552 words 148 times minutes equals m 3552 m 3552 ÷ 148

13 Writing Equations A formula is an equation that states a rule for the relationship between certain quantities. Sometimes you can develop a formula by making a model. Formula

14 Answer: The formula is. Example 1-3a Translate the sentence into a formula. WordsPerimeter equals four times the length of the side. VariablesLet P = perimeter and s = length of a side. The perimeter of a square equals four times the length of the side. Perimeter equalsfour times the length of a side. P 4s Write a Formula

15 Answer: The formula is. Example 1-3b Translate the sentence into a formula. The area of a circle equals the product of  and the square of the radius r. Write a Formula A = area r = radius

16 Writing Equations You can also translate equations into verbal sentences or make up your own verbal problem if you are given an equation. Translate equations into verbal

17 Example 1-4a Translate this equation into a verbal sentence. Answer: Twelve minus two times x equals negative five. Twelve minus two times x equals negative five. 12 2x 5 Translate Sentences into Equations

18 Example 1-4b Translate this equation into a verbal sentence. Answer: a squared plus three times b equals c divided by six. a squared plus three times b equals c divided by six. a 2 3b Translate Sentences into Equations

19 Example 1-4c Translate each equation into a verbal sentence. Answer:Twelve divided by b minus four equals negative one. Answer:Five times a equals b squared plus one Translate Sentences into Equations

20 4( f ) – f = 8.25 Example 1-5a Write a problem based on the given information. Answer: The cost of a burger is $1.50 more than the cost of fries. Four times the cost of a burger minus the cost of fries equals $8.25. How much do fries cost? f = cost of fries f = cost of a burger Write a Problem

21 h – 3 = Consuelo’s height in inches 3h(h – 3) = 8262 Example 1-5b Write a problem based on the given information. Answer: Consuelo is 3 inches shorter than Tiana. The product of Consuelo’s height and three times Tiana’s is How tall is Tiana? h = Tiana’s height in inches Write a Problem


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