MCQ practice · SSC Higher Mathematics Board questions · Chapter 11: Coordinate Geometry
Which is the equation of the line parallel to the x-axis, 9 units away in the negative direction?
Think it through first, then pick an option.
- a x + 9 = 0
- b x − 9 = 0
- c y − 9 = 0
- d y + 9 = 0
Answer and explanation
Correct answer: d y + 9 = 0
A line parallel to the x-axis is y = b; 9 units in the negative direction gives y = −9, that is y + 9 = 0.
Why the other options are wrong
- a x + 9 = 0: x + 9 = 0 is x = −9, which is parallel to the y-axis.
- b x − 9 = 0: A line parallel to the x-axis is y = b; 9 units in the negative direction gives y = −9, that is y + 9 = 0. So x − 9 = 0 is not the answer.
- c y − 9 = 0: A line parallel to the x-axis is y = b; 9 units in the negative direction gives y = −9, that is y + 9 = 0. So y − 9 = 0 is not the answer.
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