Question 1000052
{{{system(x/2-y/3=0,x/6-y/18=1/2)}}}


6* the first one, 18* the second one


{{{system(3x-2y=0,3x-y=9)}}}
Slopes are unequal. One unique solution.




Digits Problem:
Original number {{{10t+u}}} with t for the ten's place and u for the units or ones place.
-
{{{system(t+u=9,10u+t=-9+(10t+u))}}}------this system of equations is an exact translation of the description into equations.  MOST important is that you be able to form these equations.  Almost as important is be able to solve the system of equations for t and u.  If you can do these, then your understanding and skill will be fine.