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

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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 x-terms are same, you can eliminate these terms by subtracting the equations. Subtract the equations to eliminate variable y.

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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 negative 1)

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

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Now Substitute –1 for y in either equation to find the value of x.

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$\"\"$ (Equation 1)

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$\"\"$ (Replace y by –1)

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$\"\"$ (Add 1 on each side)

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

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

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$\"\"$ (Divide each side by 4)

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$\"\"$ (Cancel common terms) \ \

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

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The solution is $\"\"$ . $\"\"$

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The solution is $\"\"$ .