Question 1091382
<br>Do you understand that in this problem they are defining "*" to be like a function that operates on input values x and y?  "x*y = 2x-y" means the output of the function "*" is 2 times the first input, minus the second input.  Then
"3*y" is {{{2(3)-y = 6-y}}}
and then "y*(6-y)" is {{{2(y)-(6-y) = 3y-6}}}
and so
{{{3y-6 = 6}}}
{{{3y = 12}}}<br>
So y = 4 is the answer.