Solve the system of equations by substitution.
A. x = 4, y = 0; (4, 0)
B. x = 0, y = 4; (0, 4)
C. x = 0, y = -4; (0, -4)
D. x = -4, y = 0; (-4, 0)
Answer: D
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A. 
B. 
C. 
D. 