Question 134742
A really good description of how to find an inverse function is given here --> http://www.purplemath.com/modules/invrsfcn3.htm

Given:{{{y = 3x -2}}}
{{{y+2= 3x }}}
{{{(y+2)/3 = x }}}
Now swap the variable names to get the inverse
{{{y = (x+2)/3}}}

All we need to do now is start subbing in the values given.
x = 37 --> y = 13 == letter M
x = 25 --> y = 9  == letter I
x = 19 --> y = 7  == letter G
x = 61 --> y = 21 == letter U
x = 13 --> y = 5  == letter E

Keep at the rest