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Solve the simultaneous equations. 5x+y=21, x-3y=9.

We commonly solve this via the method of substitution. We label each equation i and ii. We then solve the first equation i for a single variable. We then substitute this value into the secod equation, and solve this to get one value. We then use this value to solve the last variable.

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Solve the simultaneous equations. 5x+y=21, x-3y=9.

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