Question

How do you evaluate the expression `8+6r` given r=7?

Answer 1

Substitute 7 for the `r` and calculate the value of the expression to be 50.

Explanation:

The word evaluate means "find the value of".

In algebra, the variables represent numbers and when we know what that value is, we can replace the variable by a number and calculate a value for the expression.

`8 + 6r` means `8 + 6 xx r`

`= 8 + 6 xx (7)`

`= 8 + 42 = 50`