Question 34495
a)We can just try inputing some numbers, (4,3) this works because {{{3(4)-2(3)=12-6=6}}}.  (6,6) this works because {{{3(6)-2(6)=18-12=6}}}.  Finally, (8,9) this works because {{{3(8)-2(9)=24-18=6}}}.  

b) Now for graphing:
*[invoke describe_linear_equation 3, -2, 6]

Hope this helps,
lyra