Solve the system of equations using substitution.
A. x = 4, y = 3; x = 3, y = 4
or (4, 3), (3, 4)
B. x = -4, y = -3; x = -3, y = -4
or (-4, -3), (-3, -4)
C. x = -4, y = 3; x = -3, y = 4
or (-4, 3), (-3, 4)
D. x = 4, y = -3; x = 3, y = -4
or (4, -3), (3, -4)
Answer: A
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In this formula 
corresponds to 1987 and 
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A. {7} B. {-52} C. {-2} D. {52}
Perform the indicated operations and simplify.
+ 
- 
A. 
B. 
C. 
D. 