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Whenever
we need to tackle more advanced simultaneous equations, either
in terms of the number of variables, or in the nature of the
equations, it is necessary to be able to rearrange an equation
and apply substitution for one variable into another equation.
e.g. Solve
the simultaneous equations
| Equation
(1) can be rewritten as |
y
= 3x - 4. |
| Now,
substituting this in equation (2) for y gives |
2x
+ 3 (3x - 4) = 21 |
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