Question

If 2x = 20, then x is
a. 5. b. 10. c. 20.

Answer 1

2x=20
divide everything by 2
x=10 (answer choice b)

Answer 2

B. 10

Explanation:

To find the answer we would plug each given number into x to see if it makes the equation true

A. 2(5) = 20

10
`\\eq` 20

B. 2(10) = 20

20 = 20

C. 2(20) = 20

40
`\\eq`20

As you can see, the only answer that makes the equation 2x=20 true, is answer B