\"\"

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Elimination Method:

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The equations are

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\"\"              Equation (1)

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\"\"            Equation (2)

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Since the coefficients of the b-terms are same, you can eliminate these terms

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by subtracting the equations. Subtract the equations to eliminate variable b.

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Write the equations in column form and subtract the corresponding columns.

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\"\"

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\"\".

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\"\"

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Now, find the b value by substituting \"\" in either equation.

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\"\"                  (Equation 1)

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\"\"                          (Multiply: \"\")

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\"\"         (Add 15 to each side).

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\"\"         (Apply commutative property of addition: \"\")

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\"\"                       (Apply additive inverse property: \"\")

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\"\"                             (Apply additive identity property: \"\")

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\"\"                                   (Add: \"\") \"\"

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The solution is \"\".