Question

How do you evaluate the expression when x = 2, y = 7, z = 4 for 2z - 3?

Answer 1

Substitute `z` in.

Explanation:

You don’t need `x` and `y` because in your expression, `2x - 3`, there is no `x` and `y`. Just substitue `4` in for `z` in your expression and solve like any other expression.

Answer 2

5

Explanation:

Since the expression uses the variable `z`, substitute the number 4 in for `z`, as the instructions give us that number to use for `z`.

`2*4-3`

`8-3`

`5`