1. 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
= ?

2. 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

3. Objective
SWBAT translate verbal sentences into equations

4. 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

5. 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!

6. 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 (d)
(n)(w) p ∙ k
Division
Quotient, divided by, divided into
k/ ÷ r
Writing Equations
Symbol
Meaning
Key phrases =
Is equal to
The same as, is

7. 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.

8. 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

9. 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

10. 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

11. 24
Homework
Text p.87, #8-34 evens