I know how to use "simple" complex number on TI-89

for example: 8+i3

but how about if there is two equations and we want to solve for x and y:

for example: (1+i1.5)x + i2.5y=20 and 11x + 15y=0

solve for x and y.

Is it possible to do the calculation using solve(

I tried to do it, but I kept getting "false" answer.

Any responds would be GREATLY appreciated.

Best regards,

RC