You should be able to
solve simultaneous equations by Elimination Method
to check you answer using a calculator.
Always look through all examples in textbook before lesson.
Please watch the video lessons after this section.
Solve the following simultaneous equations:
x + 3y = 5
2x - 5y = -12
Steps:
Label both equations as (1) and (2)
Choose a variable that you would like to eliminate
Make sure the coefficient of the variable that you have chosen to eliminate is the same for both the equations
If it is not the same, multiply a constant to find the LCM for both
Add or subtract the equations to eliminate the variable chosen
If the variable have the same signs - Subtract the 2 equations
If the variable have different signs - Add the 2 equations
Once you find one variable, remember to substitute and find the other variable
You must have 2 values, one for each variable as your answer
Check if you answer is correct by using your calculator
For Casio fx-97SG X
For Casio fx-97SG X
NOTE: If you calculator is Casio fx-96SG Plus, please follow the steps.
STEPS:
Press MODE SETUP
Press 3 for EQN
Press 1: anX +bnY=Cn
You will see a square bracket with row a, b and c with column by the side 1 and 2. There is 6 small rectangles in the bracket.
a and b represents your variables and c represents your constant.
Make sure the equation is of the format anX +bnY=Cn where
an represents coefficient of X,
bn represents coefficient of Y,
Cn represents your constant.
Key in the coefficient of each variable plus the constant with the correct sign.
When your finish keying in all 6 digits, press equal sign.
The first value will be the answer for variable x. Press equal again and the next value will be the answer for variable y.