$\"\"$

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The equations are $\"\"$ and $\"\"$ .

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$\"\"$ -------------------> (Equation 1)

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$\"\"$ -------------------> (Equation 2)

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Solve the second equation for x.

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Add 0.4y to each side.

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$\"\"$

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$\"\"$ $\"\"$

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Since $\"\"$ , substitute $\"\"$ for x in second equation.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Add 0.98y to each side.

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$\"\"$

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$\"\"$ $\"\"$

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Add 2.5 to each side.

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$\"\"$

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$\"\"$

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$\"\"$

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Divide each side by 0.98.

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$\"\"$

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$\"\"$

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$\"\"$

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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The solution of the system is (x, y) = (8, 11).