Solve Simultaneous Linear Equations (for Casio fx-96SG PLUS)
The instructions works on the older Casio fx-95SG PLUS calculator as well.
Take note it only works on linear equations (powers of x and y must be equal to 1):
\begin{align*} y & = 3x - 7 \\ x & = y + 4 \end{align*}
Step 1: Manipulate the equations
Rearrange the first equation:
\begin{align*} y & = 3x - 7 \\ -3x + y & = - 7 \end{align*}
Rearrange the second equation:
\begin{align*} x & = y + 4 \\ x - y & = 4 \end{align*}
Step 2: Solve equations
Press MODE, followed by 3:
Press 1:
Enter the first equation $-3x+y = -7$ and second equation $x - y = 4$:
Press = to obtain the value of $x$ and = again to obtain the value of $y$:
Once done, press MODE followed by 1 to switch back to normal operation.