Checking parallelism PROBLEM... (SOLVED!)

[Spybot]

Hello Everyone!

Can Anyone help me with this little program? I'm trying to determine if these lines are parallel (I know they're not) but I want the program to tell it to me, I'm expecting to get a zero as result, but I'm actually getting some kind of error. I'm typing the syntax just as the calculator's help section says. I wonder what Am I doing wrong?


EXPORT test1()
BEGIN
LOCAL AA,x,y;
AA:=is_parallel(line(3*x+5*y=3),line(4*x-8*y=7));
PRINT();
PRINT(AA);
END;


Thank you.

Spybot.