Do Now 10/11/11 In your notebook, 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 2) 34 m 3) 73 in. 4) 324 in.² 5) 600 cm² 6) 30 m² 7) 268 ft, 4200ft² 8) a). A: 12ft; B: 24 ft 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. Text p. 77, #1-10 1) 17m / 1 sec 2) $360 / 1 oz 3) 1.5 in. / 1 h 4) 0.75 lb. / 1 ft² 5) 150 lb 6) 92 in. 7) $230 8) 600,000 miles 9) 15x Cal 10) 70t ft

Objective SWBAT translate verbal sentences into equations

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

Equation x + 7 = 10 Left side Right side ‘x’ has to be 3 in order to make the equation balanced. Like a scale, the left side and right side must be the same in order to be 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 Symbol Meaning Key phrases = Is equal to The same as, is

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

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

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

x + 8 = 12 16 – m = 2 20 = 5y v ÷ 8 = 8 Mental Math 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