Equations With One Variable

The sum of a number k and 5 is 11.

• 5k = 11

• 5 - k =11

• 5/k = 11

• 5 + k = 11

The difference of a number x and 2 is 7.

• x - 2 = 7

• x + 2 = 7

• 2x = 7

• 2/x = 7

6 is one-third of a number s

• 6 = 1/3 + s

• 6 = 1/3s

• 6 = 1/3 - s

A number z divided by 7 equals 4

• z + 7 = 4

• z - 7 = 4

• 7z = 4

• z/7 = 4

5 more than a number m is the same as 8

• m - 5 = 8

• m + 5 = 8

• 5m = 8

• m/5 = 8

A crew is picking up chairs in the gymnasium after an event. After clearing 217 chairs from the gym floor, 36 chairs still remain. Write an equation you can use to find the number of chairs placed on the gym floor for the event.

• 217n = 36

• n - 217 = 36

• n + 217 = 36

• n/217 = 36

Solve for x:

2x + 4 = 10

• x = 2

• x = 3

• x = 4

• x = 5

2x + 5 = 13

• x = 3

• x = 9

• x = 2

• x = 4

3x - 4 = 11

• x = 5

• x = 2

• x = 4

• x = 6

3x + 2 + 2x = 12

• x = 2

• x = 3

• x = 4

• x = 5