Casio fx-9860GII - 1.5 Solving simultaneous linear equations in three unknowns

fx-9860GII Quick Start Guide
5
Calculations can be performed with complex numbers and answers can be displayed in a+bi form.
7. To calculate (-3 + 2i ) + 15i; enter the following:
• ie(n3+2q)+15ql
Sigma calculations can also be performed in the RUN menu.
8. To calculate ; enter the following:
• iruea,s-3a,+5$a,$2$6l
RUN-MAT