Question

Question #01d14

Answer 1

To check your answer substitute the calculated value for the unknown. See explanation.

Explanation:

To check if your value is a solution of the given equation you have to substitute the calculated value for the variable and see if left side equals right.

Example 1

Suppose you got `5` as an answer. If you substitute it you get:

`3*color(red)(5)+5=20`

`15+5=20`

`20=20`

Left side equals right so the answer is correct.

Example 2

Now let's suppose that you got `3` as the answer. If you substitute you get:

`3*color(red)(3)+5=20`

`9+5=20`

`14=20`

Left side DOES NOT equal right, so the answer `3` is incorrect.