Twice a number plus four equals 22 .what is the number ?

Question

asked Nov 5, 2023 80.8k views

1 Answer

Cesar Daniel · Answer 1 · 2023-11-10T23:54:14+0000

Let's call x to the unknown number.

"Twice a number" means we need to multiply the unknown number by 2, that is, 2x.

Then, "twice a number plus four equals 22" is represented by the next equation:

Subtracting 4 at both sides of the equation:

$\begin{gathered} 2x+4-4=22-4 \\ 2x=18 \end{gathered}$

Dividing by 2 at both sides of the equation:

$\begin{gathered} (2x)/(2)=(18)/(2) \\ x=9 \end{gathered}$

The number is 9