Question 71114
U+T=8 U=8-T
T+10U=7*T NOW SUBSTITUTE (8-T) FOR U IN THIS EQUATION & SOLVE FOR T
T+10(8-T)=7T
T+80-10T-7T=0
-16T=-80
T=8-/16
T=5 THIS IS THE TENS DIGIT THEREFORE THE U NITS DIGIT IS 8-5=3
PROOF
5+10*3=7*5
5=30=35
35=35