Solve the system of linear equations.
x + 
y = 4
x - 2y = 21
A. Infinitely many solutions
B. No solutions
C. (6, -8)
D. (-6, 8)
Answer: C
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Perform the indicated operations and simplify the result. Leave the answer in factored form.
÷ 
A. 
B. 
C. 99
D. 1
Give the coordinates of the labeled points.
A. A(-1, 0); B(-1, -2) B. A(-1, 1); B(1, -2) C. A(1, 0); B(1, -2) D. A(-1, 0); B(1, -2)
Solve the linear programming problem.A doctor has told a sick patient to take vitamin pills. The patient needs at least 6 units of vitamin A and at least 6 units of vitamin B. The red vitamin pills cost 
each and contain 1 unit of A and 2 units of B. The blue vitamin pills cost 
each and contain 2 units of A and 1 unit of B. To avoid indigestion, the patient should take no more than 4 red pills and no more than 7 blue pills. How many pills should the patient take each day to minimize costs?
A. 4 red and 7 blue B. 2 red and 2 blue C. 0 red and 6 blue D. 4 red and 1 blue
Use the properties of logarithms to find the exact value of the expression. Do not use a calculator.log8 8-3
A. 8 B. -24 C. -3 D. 1