Unit 3 Test Review (part 1)

Single-Step Equations

100

13+x=17

x=4

200

x-3=16

x=19

300

6x=66

x=11

400

x/9=4

x=36

500

x/15=-21

x = -315

Two-Step Equations

100

3x+5=14

x=3

200

2x-16=4

x=10

300

4+7x=46

x=6

400

-5+15x=40

x=3

500

8+3x=-10

x=-6

Negative Coefficient

100

-2x=14

x=-7

200

-x/15=7

x=-105

300

3-8x=43

x=-5

400

-6x-12=-36

x=2

500

6-0.5x=18

x=-24

Distributive Property First

100

2(x+1)=14

x=6

200

4(2x-6)=48

x=9

300

3(7x-5)=174

x=9

400

-2(x+4)=-16

x=4

500

-4(7x-3)=68

x=-2

Find the Error

100

x/5=-25

x=5

x is actually -100 because 5 times -25 is -100.

200

6x=24

x=144

They should have divided: x = 4

300

4x-5=19

4x=14

x=14/4

Step 1: they should have added 19+5.

4x=24

x=6

400

3-7x=28

3x=21

x=7

They messed up the variable term!

Step1: -3 from both sides -7x=25

Step 2: divide 

x=-25/7

500

-4(x-3)=36

4x+12=36

4x=24

x=6

They forgot the negative in step 1!

-4x+12=36

-4x=24

x=-6