Solve the system of equations using substitution.
A. x = -8, y = 5 or (-8, 5)
B. x = -8, y = -5 or (-8, -5)
C. x = 8, y = -5 or (8, -5)
D. x = 8, y = 5 or (8, 5)
Answer: D
Mathematics
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Find Dxy. y = 2
A. 
B. 
C. 7x6
D. 
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A. 5
B. y5
C. y
D. y10
Mathematics
Solve the right triangle using the information given. Round answers to two decimal places, if necessary. 
a = 3, B = 30°; Find b, c, and A.
A. b = 1.73 c = 4.46 A =60° B. b = 1.73 c = 3.46 A = 60° C. b = 2.73 c = 3.46 A = 60° D. b = 2.73 c = 4.46 A = 60°
Mathematics
Rewrite the expression as the sum and/or difference of logarithms, without using exponents. Simplify if possible.log2
A. 
log2m + 
log2n - 
log2k
B. 5 log2m + 9 log2n - 2 log2k
C. 
log2m + 
log2n - 2 log2k
D. 
log2m ? 
log2n ÷ 2 log2k
Mathematics