A 15 percent tip of 24% is $3.60
So..to make it easier you can jut multiply by 2 on both sides...
so you get 3y-2y=8+y..
which is equal to 0=8..but because they arent equal it means that there is no solution.
You check if it is even and that the sum of the digits is divisible by 3. That's the divisibility rule of 6.