You can solve linear equations of 2 or 3 variables or quadratic or cubic equations using your Casio991ES or Casio 991MS calculators.
Step 1: Program your calcy for the EQN mode. Press MODE followed by 5.
Step 2: Press the number corresponding to the type of the eqn you want to solve.
1: anX+bnY=cn
2: anX+bnY+cnz=dn
3: aX2+bX+c=0
4: aX3+bX2+cX+d=0
Step 4: A matrix form appears. Feed in the constants by pressing = after every constant.
Step 5: Press = to get the solution.
Step 6: Press = to get the solutions of all the variables.
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