Equations

Vocabulary

100

In an expression, it's the value that does not change.

constant

200

In the expression 3x + 7, the coefficient is __.

3

300

In the expression 9x + 2, 9x and 2 are called __.

Terms

400

The goal of solving any equation is to __.

Find the value of the variable by isolating it.

500

When solving an equation, ask yourself these questions:

What do I see? How do I undo it?

Expressions

100

3x + 7 + 9x

12x + 7

200

9(4x - 2)

36x - 18

300

n² + 5n + 8 + 3n + 7n²

8n² + 8n + 8

400

-(7 - 5x)

-7 + 5x

500

6(4y + 1) - 2(y + 7)

22y - 8

Equations (Level 1)

100

x + 4 = 16

x = 12

200

-7n = 63

n = -9

300

2 = w - (-11)

-9 = w or w = -9

400

k/6 = 15

k = 90

500

-3x/5 = 30

x = -50

Equations (Level 2)

100

3x + 7 = -11

x = -6

200

-1 + 4m = 31

m = 8

300

5 = 6 - 2e

0.5 = e or e = 0.5

400

2 - x/8 = 0

x = 16

500

n/10 + 12 = 7

n = -50

Equations (Level 3)

100

3(x + 9) = 6

x = -7

200

9y - 7y + 14 = 6

y = -4

300

11 + 5h + 4 = 45

h = 6

400

6x + 2(x + 12) = 16

x = -1

500

3(2w - 4) + (w + 12) = 49

w = 7