Simplify. Assume that the variables are positive.
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Solve using the substitution method. Use a graphing calculator to check your answer. x + 4y = 23 9x + 4y = -17
A. (-5, 7) B. (5, 6) C. (-4, 6) D. No solution
Solve the problem.The forearm length in centimeters, A, can be approximated by a linear function of the foot length in centimeters, f. Use the points (25, 24) and (33, 33) to find a linear model for the data in the table below. 
A. A = 1.125f - 4.125 B. A = 1.125f + 4.125 C. A = f - 1 D. A = 0.889f + 1.775
Solve the rational inequality and graph the solution set on a real number line. Express the solution set in interval notation.
? 0
A. (-?, -8] or [-4, ?)
B. (-8, -4]
C. (-?, -8) or [-4, ?)
D. [-4, ?)
Determine whether the ordered triple is a solution of the system.(0, -5, 5)
A. Yes B. No