The book The Essentials of Algebra for Secondary Schools was written by author Robert J Robert Judson Aley Here you can read free online of The Essentials of Algebra for Secondary Schools book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Essentials of Algebra for Secondary Schools a good or bad book?
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Ordinates, or y-distances, are always LINEAR EQUATIONS IN TWO VARIABLES. 149 measured parallel to the y-line. They are positive when measured above the a;-line and negative when measured below it. The coordinates of a point are its x and y distances. The x distance is the abscissa, and the y distance the ordinate. The coordinates of a point completely deter- mine it with respect to the lines of reference. A point is designated by its coordinates written (m, n). This means that m is the abscissa... and n the ordinate of the point. Y P, X' N P,(-S,-4) P,(2,3) M X P 4 (0,-3) Y' Fig. 2. The point P l or (2, 3) is located by measuring from to M, a distance of 2, and from if to P v parallel to OY, a distance of 3. The point P 2 or (-4, 2) is found by measuring from to N, a distance of 4, and then from N to P 2 , parallel to OF, a distance of 2. The abscissa in this case is measured to the left of OF because it is nega- 150 THE ESSENTIALS OF ALGEBRA. tive. The location of the points P 3 or (— 5 — 4) and P t or (6, — 2) is also shown on Figure 2.
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