Question

How do you evaluate `7b - 9` for b=9?

Answer 1

`= 54`

Explanation:

`7b - 9`

The value of the variable is :
`color(blue)(b = 9`

Substituting the same in the expression.
`7b - 9 = 7 * color(blue)(9)- 9`

`= 63 - 9`

`= 54`