Question 1118053
t, the tens digit
u, the ones digit
{{{system(10t+u=1+6(t+u),t+10u=(10t+u)-9)}}}


Simplify and solve.


{{{system(4t-5u=1,t-u=1)}}}


Use second equation for t in terms of u.
{{{t=u+1}}}


Substitute into first equation.
{{{4(u+1)-5u=1}}}
.
.
{{{system(u=3,and,t=4)}}}


The number:  {{{highlight(43)}}}