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If I understand the grammar correctly, the answer is one line.
That's the one usually called the ' x-axis ', but more formally known as the abscissa axis. It divides the plane into the upper/positive half and lower/negative half, and the numbers on it measure how far left or right of center a point is.
Its when a plane gets cut in half by Godzilla, and then its just laying there on the ground open.
Yes. If points are on the same side of a line, they are in a half-plane.