Collect like terms.
x + 
y - 
x - 
y + 20
A. 2x + 
y + 20
B. 
x + 
y + 20
C. 2x + 
y + 20
D. 2x + 
y + 20
Answer: C
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A. $13,350 B. $14,000 C. $0 D. $7,000
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A. (-1, 9) B. (-1, -9) C. (1, -9) D. (1, 18)
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