Question

What is the value of the expression below when y = 8 and z = 9?
5y – 2z

Answer 1

`\boxed {\tt 22}`

Explanation:

We are given the expression:

`5y-2z`

We want to find the value of the expression when y=8 and z=9. Therefore, we must substitute 8 in for y and 9 in for z.

`5(8)-2(9)`

Solve according to PEMDAS: Parentheses, Exponents, Multiplication, Division, Addition, Subtraction.

Multiply 5 and 8.

`40-2(9)`

Multiply 2 and 9.

`40-18`

Subtract 18 from 40.

`22`

The value of the expression 5y-2z at y=8 and z=9 is 22.