Answer:
[tex]t=\frac{u}{2}[/tex] would complete the system
Number is 36
Step-by-step explanation:
Let t = the tens digit, u = the units digit
We have the sum of the two digits of a number is 9
t + u = 9
We also have the tens digit is one-half the units digit
[tex]t=\frac{u}{2}[/tex]
Substituting
[tex]\frac{u}{2}+u=9\\\\\frac{3u}{2}=9\\\\u=6[/tex]
t + 6 = 9
t = 3
So the number is 36.
