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