Ch 13 Introduction to Algebra Review

Integers

100

Name the opposite of the integer.

3

-3

200

Name the opposite of the integer.

-17

17

300

Name the opposite of the integer.

0

0

400

Compare the integers using > or <.

-3 _____ 2

-3   <   2

500

Compare the integers using > or <.

-4 _____ -9

-4   >   -9

Adding, Subtracting, Multiplying, Dividing

100

-18 ÷ -2

9

200

6 + (-8)

-2

300

5 - 19

-14

400

-6 x 3

-18

500

-2 - (-4)

2

One-Step Add/Sub

100

8 + x = 20

x = 12

200

-9 + c = 21

c = 30

300

-1 = c - 1

c = 0

400

-5 + y = -15

y = -10

500

-7 = x - 5

x = -2

One-Step Mult/Div

100

-3a = -24

a = 8

200

-3r = -15

r = 5

300

x ÷ 4 = -3

x = -12

400

b ÷ 9 = 4

b = 36

500

25p = -100

p = -4

Vocabulary

100

What is a variable? Give an example.

A variable is a symbol, usually a letter, that represents an unknown number.

a, b, n, x, y

200

Simplify by combining like terms.

-3a + 9c + 8c

-3a + 17c

300

How would you graph the point (4, -1)?

Starting from the origin, move to the right 4 spaces and move down 1 space.

400

Absolute value is the distance a number is from zero. What is the absolute value of -3?

|-3| = 3

500

The Commutative Property states that two numbers may be added or multiplied in either order.

2 x 7 =

2 x 7 = 7 x 2

Two-Step Equations

100

3x + 4 = 19

x = 5

200

9b - 2 = 34

b = 4

300

-5a + 2 = 32

a = -6

400

4 - 3v = 40

v = -12

500

-2x + 3 = -25

x = 14