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The formula 0 = Ax + By + C is said to be the 'general form' for the equation of a line.

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This is called the slope-intercept form because "m" is the slope and "b" gives the y-intercept.

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A point on the graph where x is equal to zero.

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A point on the graph where y is equal to zero.

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A line is said to be perpendicular to another line if the two lines intersect at a right angle.

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Parallel lines are two lines that are always the same distance apart and never touch.

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A line parallel to the y-axis is called a horizontal line.

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A line parallel to the x-axis is called a horizontal line.

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In mathematics, the slope or gradient of a line is a number that describes both the direction and the steepness of the line.