Question

Select all the expressions that are equivalent to 18x – 6.
16.4x – 6 + 1.6x
2(9x – 3)
3(9x – 2)
12x – 6 – 6x
6(3x – 1)

Answer 1

The expressions equivalent to 18x − 6 are:

- 16.4x − 6 + 1.6x = (16.4x + 1.6x) − 6 = 18x − 6
- 2(9x − 3) = 18x − 6
- 6(3x − 1) = 18x − 6

The others are not equivalent:
- 3(9x − 2) = 27x − 6
- 12x − 6 − 6x = 6x − 6