You can put this solution on YOUR website! Here is the original problem:
find the function
k(x)= x + 6
The phrase you want to remember is "letter goes away and number comes to stay".
k(0) = 0 + 6 = 6
k(-2)= -2 + 6 = 4
k(-19)= -19 + 6 = -13
k(8)= 8 + 6 = 14
k(x+13)= X + 13 + 6 = X + 19.