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By Zoque E.

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Sometimes a point on a graph is named by using a letter. To identify its location, you can write the ordered pair that represents the point. Example 2 Identify Ordered Pairs Write the ordered pair that names each point. a. M Step 1 Start at the origin. Step 2 Move right on the x-axis to find the x-coordinate of point M, which is 2. Step 3 y M N Move up the y-axis to find the y-coordinate, which is 5. The ordered pair for point M is (2, 5). P O b. N The x-coordinate of N is 4, and the y-coordinate is 4.

Sean grew from a height of 65 inches to a height of 68 inches. 54. Define a variable. Then write an equation that can be used to find the increase in height. 55. How many inches did Sean grow? com/self_check_quiz Lesson 1-5 Variables and Equations 31 56. CRITICAL THINKING Write three different equations in which there is no solution that is a whole number. Answer the question that was posed at the beginning of the lesson. 57. WRITING IN MATH How is solving an open sentence similar to evaluating an expression?

C. 6(2 ϩ 9) Ϫ 3 и 8 6(2 ϩ 9) Ϫ 3 и 8 ϭ 6(11) Ϫ 3 и 8 ϭ 66 Ϫ 3 и 8 ϭ 66 Ϫ 24 ϭ 42 Evaluate (2 ϩ 9) first. 6(11) means 6 ϫ 11. 3 и 8 means 3 times 8. Subtract 24 from 66. d. 4[(15 Ϫ 9) ϩ 8(2)] 4[(15 Ϫ 9) ϩ 8(2)] ϭ 4[6 ϩ 8(2)] ϭ 4(6 ϩ 16) ϭ 4(22) ϭ 88 Evaluate (15 Ϫ 9). Multiply 8 and 2. Add 6 and 16. Multiply 4 and 22. 53 ϩ 15 e. ᎏᎏ 17 Ϫ 13 53 ϩ 15 ᎏᎏ ϭ (53 + 15) Ϭ (17 – 13) 17 Ϫ 13 ϭ 68 Ϭ 4 ϭ 17 Rewrite as a division expression. Evaluate 53 ϩ 15 and 17 Ϫ 13. Divide 68 by 4. TRANSLATE VERBAL PHRASES INTO NUMERICAL EXPRESSIONS You have learned to translate numerical expressions into verbal phrases.

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