Answer:
[tex]\boxed {\tt 22}[/tex]
Step-by-step explanation:
We are given the expression:
[tex]5y-2z[/tex]
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.
[tex]5(8)-2(9)[/tex]
Solve according to PEMDAS: Parentheses, Exponents, Multiplication, Division, Addition, Subtraction.
Multiply 5 and 8.
[tex]40-2(9)[/tex]
Multiply 2 and 9.
[tex]40-18[/tex]
Subtract 18 from 40.
[tex]22[/tex]
The value of the expression 5y-2z at y=8 and z=9 is 22.
