**TI89**mainProgram file 01/16/07, 13:57ReulnumF¥Zì() Prgm ClrIO FnOff Input "initial x",x Input "initial y",y Input "stepsize",s 0c Lbl p c+1c x+su y+y1(x)*sv Disp "this is step number",c Disp "the x coord is",u Disp "the y coord is",v Pause ClrIO ux vy Goto p EndPrgmäåÜ'J