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Here we
need to substitute one variable from the linear equation into
the more complicated equation.
e.g.
Solve the simultaneous equations 
The linear
equation is (1) which we can either rewrite as x = 11 -
2y or 
However,
when we substitute either of these forms in equation (2),
we want to make the resulting equation easy to manipulate.
We can therefore avoid any fractions by making the substitution
x = 11 - 2y.
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(2) now becomes |
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*hard
level
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