Solve the system by substitution. If the system is inconsistent or dependent, say so.x + y = -5x = y + 18
A. (6.5, 11.5)
B. (5, -11.5)
C. (5, 6.5)
D. (6.5, -11.5)
Answer: D
Mathematics
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Provide an appropriate response.Why is it not possible to choose h and k, neither zero, so the parabola 
has its vertex at the origin?
What will be an ideal response?
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Find the simple interest. Round your answer to the nearest cent.Principal = $2620Rate = 12%Time in months = 18
A. $47,160.00 B. $17.47 C. $471.60 D. $5659.20
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Change the given quantity to the indicated unit.7.7 sec = 
mcsec
A. 77,000,000 B. 7,700,000 C. 770,000 D. 77,000
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Determine the appropriate rotation formulas to use so that the new equation contains no xy-term.3x2 + 5xy + 3y2 - 8x + 8y = 0
A. x = -y' and y = x'
B. x = 
x' - 
y' and y = 
x' + 
y'
C. x = 
x' - 
y' and y = 
x' + 
y'
D. x = 
(x' - y') and y = 
(x' + y')
Mathematics