Use a graphing calculator to make a conjecture as to whether each equation is an identity.sin 
cos 
= 
A. Not an identity
B. Identity
Answer: B
Mathematics
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Solve the system by the substitution method.x2 - y2 = 39 x - y = 3
A. {(-8, -5)} B. {(8, -5)} C. {(-8, 5)} D. {(8, 5)}
Mathematics
Find the constant of proportionality k, and write the linear function relating the two variables.Suppose that y is inversely proportional to x. When x = 24, then y = 
.
A. k = 72; y = 72x
B. k = 8; y = 
C. k = 8; y = 
D. k = 
; y = 
Mathematics
Write the system of equations associated with the augmented matrix. Do not solve.
A. 
B. 
C. 
D. 
Mathematics
Give all solutions of the nonlinear system of equations, including those with nonreal complex components. xy = 112y2 - x2 = 11
A. 
B. 
C. {(2i
, -i
), (-2i
, i
), (
, 
), (-
, -
)}
D. 
Mathematics