Solve the system by the substitution method.y2 - x2 = 6x - 7 = y
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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Determine whether the function satisfies a Laplace equation.f(x, y) = e-9y sin(-9x)
A. Yes B. No
Mathematics
Find the center of the ellipse.9x2 + 18x + 25y2 - 250y + 409 = 0
A. (-1, 5) B. (-6, 5) C. (5, -6) D. (5, -1)
Mathematics
Calculate the binomial coefficient: 
A. 6652800 B. 88 C. 165 D. 1 E. 0
Mathematics
Rationalize the denominator.
A. 
B. 
C. 
D. 
Mathematics