$\"\"$

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The equations are

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$\"\"$ Equation (1)

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$\"\"$ Equation (2)

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Solve the second equation for s in terms of t.

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Apply subtraction property of equality; if a = b, then $\"\"$ .

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Subtract $\"\"$ from each side.

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$\"\"$

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$\"\"$

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

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Substitute $\"\"$ in Equation (1).

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$\"\"$

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$\"\"$

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Product of two different sings is negative.

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$\"\"$

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Distribute terms using Distributive property: $\"\"$ .

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$\"\"$

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$\"\"$

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Add 12 to each side.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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The solution is $\"\"$ .