Question

Find the value of x in the equation 13 − x = 21. Question 15 options: −34 −8 34 8

Answer 1

Hello !

`13 - x = 21\\\\13 - x - 13 = 21 - 13\\\\-x = 8\\\\\boxed{x = -8}`

Answer 2

Hello !

Answer:

`\boxed{\sf x=-8}`

Explanation:

We're looking for the value of x that satisfies the following equation :

`\sf 13-x=21`

Let's isolate x in the equation.

First, substract 13 from both sides :

`\sf 13-x-13=21-13\\\sf -x=8`

Now let's multiply both sides by -1 :

`\sf -1* (-x)=-1* 8\\\boxed{\sf x=-8}`

Have a nice day ;)