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$\"\"$

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The equations are \ \

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$\"\"$ Equaton(1) \ \

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$\"\"$ Equaton(2) \ \

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Substitute $\"\"$ for y in the Equation (2).

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$\"\"$

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$\"\"$

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According to subtraction property of equality; if $\"\"$ , then $\"\"$ .

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$\"\"$ (Subtract x from each side).

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$\"\"$ (Subtract: $\"\"$ ).

\ $\"\"$

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According to addition property of equality; if $\"\"$ , then $\"\"$ ;

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$\"\"$ (Add 4 to each side)

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

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

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

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Substitute 4 for x in equation (2).

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$\"\"$

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

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The solution is $\"\"$ .

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