Solve.A young married couple had a combined annual income of $80,000. If the wife made $4000 more than the husband, write these relationships as a system of equations. Let x be the husband's income and let y be the wife's income.
A. x + y = 4000
y = x + 80,000
B. x + y = 80,000
y = 4000
C. x - y = 80,000
y = x + 4000
D. x + y = 80,000
y = x + 4000
Answer: D
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