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

Using a graphic display calculator
© Oxford University Press 2012: this may be reproduced for class use solely for the purchaser’s institute
Casio fx-9860GII
Choose equations in two unknowns and press
F1
.
Note: This is how you will use the linear equation solver in your
examinations. In your project, you might want to solve a more complicated
system with more equations and more variables.
You will see the template on the right.
Type the coeffi cients from two equations into the
template, pressing
EXE
after each number.
Press
F1
and the calculator will solve the equations, giving the solutions as
X and Y.
The solutions are x = 4, y = 2.
1.5 Solving simultaneous linear equations in three unknowns
When solving simultaneous equations in three unknowns there might be a
unique solution, infi nitely many solutions or no solutions at all. Geometrically,
if the equations represent planes in three-dimensions, then their solutions
would be intersection at a point, intersection on a line (or plane) or
non-intersecting planes.
The equations must
be in the correct order.
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