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If b = 0 in ax + by + c = 0 with a not zero, the line is parallel to which axis?
AThe x-axis
BThe line y = x
CThe y-axis
DThe line y = -x
Answer & Solution
Correct answer: C. The y-axis
With b = 0 the equation becomes x = -c/a, a constant x value, so the line is parallel to the y-axis.
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