For the following pair of equations, predict whether they represent parallel lines, perpendicular lines, or lines that intersect but are not perpendicular.
?
5.4x + 9.9y = 6.6 and 9.9x - 5.4y = 8.2
?
A. parallel lines
B. lines that intersect but are not perpendicular
C. perpendicular lines
Answer: C
Mathematics
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The 
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A. completing the square B. discriminant C. quadratic formula D. quadratic
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A. 
B. 
C. 
D. 
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Evaluate.10x2 for x = -11
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