Solve by the elimination method.x + y = 12x - y = -6
A. {(-3, 10)}
B. {(3, 9)}
C. {(2, 10)}
D. No solution
Answer: B
Mathematics
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Provide an appropriate answer.Suppose that x2 + y2 = r2 and x = r cos ?, as in polar coordinates. Find 
r.
A. 
r= -r sin ?
B. 
r= r(cos ? - sin ?)
C. 
r= 0
D. 
r= r cos ?
Mathematics
Use a truth table to determine whether the symbolic form of the argument is valid or invalid.p ? q
? ~q
A. Valid B. Invalid
Mathematics
If y varies inversely as x, write a general formula to describe the variation.y = 0.8 when x = 0.2
A. y = 
B. y = 6.25x
C. y = 4x
D. y = 
Mathematics
Solve the equation.-3x = -12
A. -9 B. -4 C. 9 D. 4
Mathematics