And equation and solve a number increased by four and then doubled is the same as 28 decreased by three times the number find the number

Given:

A number increased by four and then doubled is the same as 28 decreased by three times the number.

To find:

The unknown number.

Solution:

Let the unknown number be x.

The number increased by four = x+4

And then doubled = 2(x + 4)

Three times the number = 3x

28 decreased by three times the number = 28 - 3x

Now,

Isolate variable terms.

Divide both sides by 5.

Therefore, the value of unknown number is 4.

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value