Question

Translate the sentence into an equation.Twice the difference of a number and 9 equals 6.Use the variable y for the unknown number.

Answer 1

The difference of a number (y) and 9 is written as

`y-9`

Then, twice the difference of a number and 9 is

`2(y-9)`

Finally, set the later expression to be equal to 6,

`\Rightarrow2(y-9)=6`

The equation is 2(y-9)=6