Find an equation of the line that contains the given pair of points. Write the equation in the form y = mx + b.(-9, -2) and (0, -4)
A. y = 
x - 4
B. y = 
x - 4
C. y = - 
x - 4
D. y = - 
x - 4
Answer: D
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Identify the quantities that are variable and the quantities that are constant.(the number of ounces in a pound of flour) ÷ (the number of guests at dinner)
A. number of ounces: constant; number of guests: variable B. number of ounces: variable; number of guests: variable C. number of ounces: constant; number of guests: constant D. number of ounces: variable; number of guests: constant
Solve graphically.x + 4 = 2yx - 4 = 2y
A. (0, 2) B. No solution C. (-4, 0) D. Infinitely many solutions
Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. 2x + y + 2z - 4w = 10x + 3y + 2z - 11w = 173x + y + 7z - 21w = 0
A. {(w + 5, 8w + 4, -3w - 2, w)} B. {(3w + 5, 6w + 6, -4w - 3, w)} C. {(-3w + 5, 2w + 6, 4w - 3, w)} D. {(w - 5, 8w - 4, -3w + 2, w)}
Write the standard form of the equation of the circle. 
A. (x + 4)2 + (y + 5)2 = 4 B. (x - 4)2 + (y - 5)2 = 4 C. (x - 4)2 + (y - 5)2 = 2 D. (x + 4)2 + (y + 5)2 = 2