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You cannot work a simultaneous equation. You require a system of equations. How you solve them depends on their nature: two or more linear equations are relatively easy to solve by eliminating variables - one at a time and then substituting these values in the earlier equations. For systems of equations containing non-linear equations it is simpler to substitute for variable expression for one of the variables at the start and working towards the other variable(s).

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There are several ways to do that: for example substitution, or subtracting one equation (or a multiple of one equation) from the other.

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7y ago
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Q: How do you work a simultaneous equation?
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