digit problems? system of equations?
A two digit number is four times the sum of its digits. The tens digit is 3 less than the units digit. What is the number?

Question

anonymous · Answer

I have got 2 equations but i don't know if they are right or not... 
t is the tens digit
u is the units (ones) digit
10t+u=4(t+u)
t=u-3

anonymous · Answer

I keep getting 9 but its gotta be a 2 digit number...

slaaibak · Answer

36

anonymous · Answer

^ can you show your work please?

slaaibak · Answer

I guessed, lol. But, I will do it for you.

anonymous · Answer

oh hahaha okay...

slaaibak · Answer

10t + u = 4(u + t)
t = u - 3

10u - 30 + u = 8u - 12
3u = 18
u = 6

t = 6-3
t=3

therefore it's 36

anonymous · Answer

thanks so much! you wouldnt mind doing a few others would you? just finding the equations?

slaaibak · Answer

Sure, I'll help