$\"\"$

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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 m-terms are same, you can eliminate these terms

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

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

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$\"\"$

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$\"\"$ (Divide each side by 2)

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$\"\"$ (Canccel common terms) \ \

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$\"\"$ (Divide: $\"\"$ ) $\"\"$

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Now Substitute 4 for n in either equation to find the value of m.

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$\"\"$ (Equation 1)

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$\"\"$ (Replace n by 4)

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

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$\"\"$ (Add 20 to each side)

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$\"\"$ (Additive inverse property: $\"\"$ )

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

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$\"\"$ (Divide each side by 2)

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$\"\"$ (Canccel common terms)

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$\"\"$ (Divide: $\"\"$ )

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The solution is $\"\"$ .

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$\"\"$

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The solution is $\"\"$ .