(Chapter 1: Review) 1.15 PART G: THE VERTICAL LINE TEST (VLT)An equation in xand ydescribes yas a function of x, and we can then say y=fx()±Its graph passes the VLTin the standard xy-plane, meaning that there is novertical line that intersects the graph more than once (i.e., there is no input xthat yields more than one output y). ExampleThe graph of x2+y2=9is a circle of radius 3 centered at the origin. It fails
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