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What are they?. Simply 2 equationsWith 2 unknownsUsually x and yTo SOLVE the equations means we find values of x and y thatSatisfy BOTH equations [work in]At same time [simultaneously]. Elimination Method. 2x y = 1. 3x y = 9. We have the same number of y's in each. If we ADD the equations,

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## Simultaneous Equations

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**1. **Simultaneous Equations OCR Module 8

**2. **What are they? Simply 2 equations
With 2 unknowns
Usually x and y
To SOLVE the equations means we find values of x and y that
Satisfy BOTH equations [work in]
At same time [simultaneously]

**3. **Elimination Method

**7. **Basic steps Look at equations
Same number of x’s or y’s?
If the sign is different, ADD the equations otherwise subtract tem
Then have ONE equation
Solve this
Substitute answer to get the other
CHECK by substitution of BOTH answers

**8. **What if NOT same number of x’s or y’s?

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