Find an equation for the line.
A. y = 2x - 9
B. y = 2x + 6
C. y = 
x + 
D. y = 2x + 7
Answer: D
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Sketch the level curve z = k for the indicated values of k.z = 
, k = -4, -1, 0, 1, 4
A. 
B. 
C. 
D. 
Solve the equation 
for x.
?
A. There is no solution.
B. 
C. ?
D. ?
Determine the center and the radius of the circle.16(x + 3)2 + 16(y - 3)2 = 49
A. (3, -3), r = 
B. (3, -3), r = 7
C. (-3, 3), r = 
D. (3, -3), r = 
Express the exercise as a system of linear equations, then find the solution. Use a calculator where appropriate.A vendor sells hot dogs and bags of potato chips. A customer buys 5 hot dogs and 2 bags of potato chips for $13.75. Another customer buys 2 hot dogs and 2 bags of potato chips for $7.00. Find the cost of each item.
A. $2.25 for a hot dog; $1.25 for a bag of potato chips B. $2.25 for a hot dog; $1.50 for a bag of potato chips C. $2.50 for a hot dog; $1.50 for a bag of potato chips D. $1.25 for a hot dog; $2.25 for a bag of potato chips