It is the Cartesian plane
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You need an x axis, y axis, and 4 quadrants.
Points on a grid? It would then be x,y and z coordinates
A coordinate grid is made of up a horizontal X-axis and a vertical Y-axis. One uses the numbers along each axis to plot points. Points are listed as coordinates in an (X, Y) format. To graph a point on a coordinate grid you need to mark the point at which the X value and Y value intersect. For example, if you had a given point of (2, 5), you would find the line corresponding to 2 on the X-axis and you would find the line corresponding to 5 on the Y-axis. Wherever these two lines cross on the coordinate grid, you make a point. Simple as that!
its easier solve for y an plot the corresponding pointsyou,ll get Y=-x+9 an then you find your coordinate points-2,11-1,100,91,82,73,6etcand then plot those points
They are the data points, plotted on the appropriate coordinates!