All Subjects Fundamental Ideas Parallel Lines Triangles Polygons Perimeter and also Area Similarity Right Angles Circles Geometric Solids Coordinate Geometry

Theslope of a lineis a measurement of the steepness and direction of a nonvertical line. When a line rises from left to ideal, the slope is a positive number. Figure 1(a) reflects a line through a positive slope. When a line drops from left to ideal, the slope is an adverse number. Figure 1(b) mirrors a line with an unfavorable slope. Thex‐axis or any line parallel to thex‐axis has actually a slope of zero. Figure 1(c) reflects a line whose slope is zero. They‐axis or any type of line parallel to they‐axis has actually no characterized slope. Figure 1(d) mirrors a line with an unidentified slope.

You are watching: What is the slope of the x axis Figure 1 Different possibilities for slope of a line.

Ifmrepresents the slope of a line andAandBare points via works with (xl,y1) and (x2,y2) respectively, then the slope of the line passing throughAandBis given by the complying with formula. AandBcannot be points on a vertical line, sox1andx2cannot be equal to one an additional. lfx1=x2, then the line is vertical and also the slope is undefined.

Example 1:Use Figureto find the slopes of linesa, b, c, andd. Figure 2 Finding the slopes of specific lines.

a. (a) Lineapasses through the points (−7, 2) and (−3, 4). b. (b) Linebpasses via the points (2, 4) and (6, −2). c. (c) Linecis parallel to thex‐axis. Thus,m= 0.

d. (d) Linedis parallel to they‐axis. Therefore, linedhas actually an unidentified slope.

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Example 2:A line passes through (−5, 8) through a slope of 2/3. If an additional suggest on this line has actually collaborates (x, 12), findx. Previous Midallude Formula

Next Slopes Parallel and Perpendicular Lines

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