# Do Now 10/9/09 Take out HW from last night. Take out HW from last night. Text p. 70, #1-8 all Text p. 70, #1-8 all Text p. 77, #1-10 all Text p. 77, #1-10.

## Presentation on theme: "Do Now 10/9/09 Take out HW from last night. Take out HW from last night. Text p. 70, #1-8 all Text p. 70, #1-8 all Text p. 77, #1-10 all Text p. 77, #1-10."— Presentation transcript:

Do Now 10/9/09 Take out HW from last night. Take out HW from last night. Text p. 70, #1-8 all Text p. 70, #1-8 all Text p. 77, #1-10 all Text p. 77, #1-10 all Copy HW in your planner. Copy HW in your planner. Text p.87, #8-34 evens Text p.87, #8-34 evens In your journal, describe the PROCESS (steps you would take) to solve the following question. Then solve. What is this an example of? In your journal, describe the PROCESS (steps you would take) to solve the following question. Then solve. What is this an example of? + 7 = 10 = ?

Homework Text p. 70, #1-8 all 1) 36 ft 1) 36 ft 2) 34 m 2) 34 m 3) 73 in. 3) 73 in. 4) 324 in.² 4) 324 in.² 5) 600 cm² 5) 600 cm² 6) 30 m² 6) 30 m² 7) 268 ft, 4200ft² 7) 268 ft, 4200ft² 8) a). A: 12ft; B: 24 ft 8) a). A: 12ft; B: 24 ft b). A: 9 ft²; B: 36 ft² b). A: 9 ft²; B: 36 ft² c). The perimeter of B is twice that of A. The area of A is 4 times that of B. c). The perimeter of B is twice that of A. The area of A is 4 times that of B. Text p. 77, #1-10 1) 17m / 1 sec 1) 17m / 1 sec 2) \$360 / 1 oz 2) \$360 / 1 oz 3) 1.5 in. / 1 h 3) 1.5 in. / 1 h 4) 0.75 lb. / 1 ft² 4) 0.75 lb. / 1 ft² 5) 150 lb 5) 150 lb 6) 92 in. 6) 92 in. 7) \$230 7) \$230 8) 600,000 miles 8) 600,000 miles 9) 15x Cal 9) 15x Cal 10) 70t ft 10) 70t ft

Objective SWBAT translate verbal sentences into equations SWBAT translate verbal sentences into equations

Section 2.4, “Variables and Equations” Section 2.4, “Variables and Equations” EQUATION – EQUATION – mathematical sentence formed by placing an “=“ between two expressions y – 8 = 12 y – 8 = 12 22 = 14 + z 11a = 121 11a = 121 x ÷ 5 = 30 x ÷ 5 = 30

Equation Like a scale, the left side and right side must be the same in order to be balanced! Like a scale, the left side and right side must be the same in order to be balanced! + 7 = 10 Left side Right side x ‘x’ has to be 3 in order to make the equation balanced.

Writing Algebraic Expressions Operation Verbal Phrase Expression Addition Sum, plus, total, more than, increased by 5 + n k + 12 Subtraction Difference, less than, minus, decreased by 12 – p x – 12 Multiplication Product, times, of, multiplied by 3 x 5 3(d) (n)(w) p ∙ k Division Quotient, divided by, divided into k/7 14 ÷ r Writing Equations SymbolMeaningKey phrases =Is equal toThe same as, is

Translate verbal phrases into equations Verbal Phrase Equation a. the difference of a number k and 8 is 12. b. the product of 6 and a number n is 24. c. the sum of a number y and 5 is 13. k – 8 = 12 6n = 24 y + 5 = 13 d. the quotient of a number z and 2 is 7. z ÷ 2 = 7

A SOLUTION of an equation with a variable is a number that produces a TRUE statement when it is substituted for the variable. k – 8 = 12 19 is NOT A SOLUTION (19) – 8 = 12 Tell whether 19 or 20 is a solution to the equation. 11 ≠ 12 20 is a SOLUTION 20 is a SOLUTION (20) – 8 = 12 12 = 12

SOLUTION– when you substitute for a variable the solution can be either TRUE or FALSE. k – 2 = 6 6n = 54 4 = 36/s Substitute 9 for each variable. Is 9 the solution for each equation? NOT A SOLUTION SOLUTION SOLUTION (9) – 2 = 6 6(9) = 54 4 = 36/(9) 7 ≠ 6 54 = 54 4 = 4

Mental Math When solving simple equations using mental math, think of the equation as a question. When solving simple equations using mental math, think of the equation as a question. x + 8 = 12 “What number plus 8 is equal to 12? “ x = 4 16 – m = 2 “16 minus what number is equal to 2? “ m = 14 20 = 5y “20 is equal to 5 times what number? “ y = 4 v ÷ 8 = 8 “What number divided by 8 is equal to 8? “ v = 64

24 Homework Text p.87, #8-34 evens Text p.87, #8-34 evens

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