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Unformatted text preview: 3x – 2y = 6 is a LINE. (only 2 variables) 3x – 2y + z = 6 is a PLANE. (3 variables) If the graph of a plane intersects one of the coordinate planes in a line, then the line is called a trace. 2 Graphing Equations in 3-D The xy-trace is the line in the xy-plane that contains the x-int and y-int (blue) The xz is in red the yz is in pink Sketching a Plane Sketch the graph of 2x + 3y + 4z = 12 (Find the intercepts. How?) You try! 1) x+y+z=5 2) 2x-y+3z=6 Homework p. 145 # 1-4, 7-10(same coor space), 19-24...
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