Problem: how would I translate this sentence into an equation?
Twice the difference of a number and 5 is 9
use the variable w for the unknown number.
Solution:
Denote the unknown number by w.
Now, the difference between a number (w) and 5 is:
w-5
twice the above is:
2(w-5)
and from the statement we know that the above must be equal to 9, that is:
2(w-5) = 9
then, the solution would be:
2(w-5) = 9