Solve. Then graph. Write the solution set using both set-builder notation and interval notation.
> 7 
A. {x
x < 21}, (-?, 21)
B. {x
x ? 21}, (-?, 21]
C. {x
x ? 21}, [21, ?)
D. {x
x > 21}, (21, ?)
Answer: D
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A. 
B. 
C. 
D. 
Solve the system of equations by the addition method.
A. (
, 
)
B. (
, 
)
C. infinite number of solutions
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