All topics basic Ideas Parallel present triangle polygons Perimeter and Area Similarity appropriate Angles circles Geometric Solids coordinate Geometry

Theslope of a lineis a measurement of the steepness and also direction that a nonvertical line. Once a line rises indigenous left to right, the slope is a positive number. Figure 1(a) reflects a line with a optimistic slope. When a line drops from left to right, the steep is a an adverse number. Figure 1(b) shows a line through a an adverse slope. Thex‐axis or any kind of line parallel to thex‐axis has actually a slope of zero. Number 1(c) reflects a line whose slope is zero. They‐axis or any type of line parallel to they‐axis has no characterized slope. Figure 1(d) shows a line through an unknown slope.

You are watching: The slope of a line parallel to the vertical axis is:


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Figure 1 Different possibilities for slope that a line.

Ifmrepresents the steep of a line andAandBare points with coordinates (xl,y1) and also (x2,y2) respectively, then the steep of the heat passing throughAandBis offered by the following formula.

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AandBcannot it is in points ~ above a upright line, sox1andx2cannot be equal to one another. Lfx1=x2, then the line is vertical and also the steep is undefined.

Example 1:Use Figureto discover the slopes that linesa, b, c, andd.

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Figure 2 Finding the slopes of specific lines.

a. (a) Lineapasses with the point out (−7, 2) and (−3, 4).

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b. (b) Linebpasses through the points (2, 4) and (6, −2).

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c. (c) Linecis parallel to thex‐axis. Therefore,m= 0.

d. (d) Linedis parallel come they‐axis. Therefore, linedhas an unknown slope.

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Example 2:A heat passes v (−5, 8) v a steep of 2/3. If another point on this heat has coordinates (x, 12), findx.

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vault Midpoint Formula


following Slopes Parallel and Perpendicular present


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