allerySolve by substitution: x + y = 10, x − y = 4.
A(7, 3)
B(3, 7)
C(5, 5)
D(4, 6)
Answer & Solution
Correct answer: A. (7, 3)
Add the two equations: 2x = 14 ⇒ x = 7, then y = 10 − 7 = 3.
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