Determine whether the rule defines y as a function of x.XY 
A. Function
B. Not a function
Answer: A
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Multiply. Write the answer in descending order and combine like terms.(2y - 5)(4y2 + 5y - 3)
A. 8y3 + 10y2 - 31y + 15 B. 8y3 + 10y2 + 31y + 15 C. 8y3 - 10y2 + 31y + 15 D. 8y3 - 10y2 - 31y + 15
Identify the quantities that are variable and the quantities that are constant.(the area of a playground) × (3 meters)
A. area: variable; 3 meters: variable B. area: constant; 3 meters: constant C. area: constant; 3 meters: variable D. area: variable; 3 meters: constant
Solve the system by substitution or elimination. If a system is inconsistent or has dependent equations, say so.x - 3y = 1x = 5 + 3y
A. {(1, 0)}
B. {(x, y)
}; dependent equations
C. {(1, 3)}
D. ?; inconsistent system
Find the focus and directrix of the parabola with the given equation.y2 = -28x
A. Focus: (7, 0), directrix: x = -7 B. Focus: (-7, 0), directrix: x = 7 C. Focus: (0, -7), directrix: y = 7 D. Focus: (0, 7), directrix: y = -7