This is the form of linear equation in two unknowns. It shows a single straight line. This is different from quadratic equations. The arrow of the line means continuity. Meaning the line is extended infinity. The illustration only shows where the line was made. It is from the origin or center (0,0) of the Cartesian plane. The vertical axis is labeled by y and the horizontal axis was labeled by x. In this photo of linear equation, x was only limited from -1 to 5, and y to -3 and 2. It is not required really to extend those grades of the line to higher number. That only depends on how less or great the given of the equation is presented. The green dot shows the exact location of the point, of a line of course. The green dot above shows the point has the (4,1) vertex and the green dot below shows (0,-2) vertex. There are a lot of linear equation in different form, not only from the photos above.
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