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The equations are
Equaton(1)
Equaton(2)
Substitute for y in the Equation (2).
Apply subtraction property of equality; if a = b, then .
(Subtract x from each side)
(Apply additive inverse property: )
(Subtract: )
Apply addition property of equality; if a = b, then a + c = b + c.
(Add 4 to each side)
(Apply additive inverse property: )
(Add: 4 + 4 = 8)
Apply division property of equality: if a = b, then.
(Divide each side by 2)
(Cancel common terms)
(Divide: )
Substitute 4 for x in equation (2).
(Add: )
The solution is (4, 8).
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