how would you write an algebraic expression for tthe same number of birds,b, sitting on three different wires, then 9 birds fly off
3b-9
To write an algebraic expression for the given scenario, we can start by representing the number of birds initially sitting on the wires.
Let's assume the number of birds sitting on each wire is b (since the prompt mentions the same number of birds on three different wires). So, there are b birds on the first wire, b birds on the second wire, and b birds on the third wire. Hence, the total number of birds initially sitting on the wires is 3b.
Next, the prompt states that 9 birds fly off. To represent this change, we subtract 9 from the initial total. Therefore, the algebraic expression for the final number of birds after 9 fly off would be:
3b - 9
This expression represents that initially, there were 3b birds on the wires, and then 9 birds flew off.