Solve the system by elimination. 7x + 3y = -6714x = -69 - 6y
A. {(-7, -6)}
B. {(2, 4)}
C. {(-7, 4)}
D. ?
Answer: D
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Determine whether the function is a one-to-one function.{(6, -10), (9, -9), (7, -8), (5, -7)}
A. Yes B. No
Sketch the graph of the quadratic function. Identify the vertex and axis of symmetry.f(x) = (x - 5)2 + 2
A. vertex (-5, 2)
axis of symmetry: x = -5
B. vertex (2, 5)
axis of symmetry: x = 2
C. vertex (5, 2)
axis of symmetry: x = 5
D. vertex (-2, -5 )
axis of symmetry: x = -2
Complete the square and write the equation in standard form. Then give the center and radius of the circle and graph the equation.x2 + y2 + 6x + 8y + 21 = 0
A. (x - 3)2 + (y + 4)2 = 4
center (3, -4), r = 2
B. (x + 3)2 + (y - 4)2 = 4
center (-3, 4), r = 2
C. (x + 3)2 + (y + 4)2 = 4
center (-3, -4), r = 2
D. (x - 3)2 + (y - 4)2 = 4
center (3, 4), r = 2
Solve the problem.If P = (-1, -4) and Q = (x, -20), find all numbers x such that the vector represented by 
has length -20.
A. {13, 11} B. {11, -14} C. {13, -13} D. {11, -13}