How do you write twice the difference of a number and 9 equals 2 as an equation?

Question

34139 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2018-04-27T06:54:59

#2(x-9) =2#

Difference indicates subtraction:

The difference of a number and #9# is #(x-9)#

Twice the difference means #2(x-9)#

We know that the answer to this is #2#, so as an equation:

#2(x-9) =2#

If you solve it we would have:

#x-9=1" "larr div 2#

#x = 1+9#

#x = 10#

The difference between #10 and 9# is #1# and twice #1# is #2#.
The number is correct.

Note that written as:

The difference of twice a number and #9# would have a different expression. This would be #2x-9#