Math 8 Equations Review

6 - 3a = 21

• a= 9
• a= -9
• a= -5
• a= 5

20 = 2 - a

• a= 18
• a= -18
• a= -10
• a= 12

7 + ^a⁄₃ = 5

• a= -2
• a= -6
• a= 3
• a= 15

-5 - 6a = -59

• a= 11
• a= -6
• a= 9
• a= 2

^{(a + 3)}⁄₇ = 3

• a= 18
• a= 21
• a= 4
• a= 11

10.    x / 2  - 5 = 3

• x = -2
• x = 2
• x = 16
• x = 8

Tags

CCSS.7.EE.B.4A

x/5 - 13 = 20

• 145
• 165
• 180
• 190

The steps in solving 5b - 6 = 24 are: 

• Add 6 to both sides and divide both sides by 5
• Add 6 to both sides and multiply both sides by 5
• Subtract 6 from both sides then multiply both sides by 5
• Subtract 6 from both sides then divide both sides by 5

-5(2-w)=10

• 3
• 4
• 10
• null

6z + 3 -4z = 9

• z = 3
• z = 60
• z = 30
• z = 1