One-Variable Equations

-4 = x + 3

• x = 7

• x = -7

• x = 1

• x = -1

3x = 4 + 2x

• x = 1

• x = 2

• x = 3

• x = 4

4x - 1 = 7

• x = 3/2

• x = 3

• x = 2

• x = 8

-x + 3 = 9

• x = 6

• x = -6

• x = 12

• x = 12

-3 = 9 + 2x

• x = 6

• x = -6

• x = -3

• x = 3

Solve:
3x + 7 = -8

• 5

• -5

• -12

• -18

Rayshawn and Robert are both saving money for their summer vacations. They began saving at the same time. Rayshawn started with $10.25 and adds $5.15 to his savings every month. Robert did not have a starting amount but adds $10.25 to his savings every month. Which equation could be used to determine how many months, m, it will take before Rayshawn and Robert both have saved the same amount of money?

• 5.15m + 10.25 = 10.25m

• 10.25m + 5.15 = 10.25m

• 10.25m + 10.25 = 5.15m

• 10.25m – 5.15 = 10.25m

Raymond buys bottles of water at $2 each and a large pizza at $13. The total cost was $21. How many bottles of water did Raymond buy?
What is the correct equation to solve?

• 2b + 13 = 21

• 2 + 13b = 21

• 2 + 13 = 21b

• 2b +21 = 13

Solve  9 + 3x = 10

• 2/3

• 1/3

• -1/3

• 4

What is the solution to this equation?

• one solution

• no solution

• infinite solutions

• none of these