Cartesian plane is the x-y coordinate plane for graphing. x axis goes horizontally, neg to left and pos to the right. y-axis is vertical, neg is down, pos is up. The center where both x and y intersect is the origin, 0 for both x and y. This divides the plane into 4 parts called quadrants.
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Given a point, let's say (1,4) that you want to plot on the cartesian plane, find 1 on the x axis and 4 on the y axis. Now, draw lines up from the 1 and across from the 4. The place these two lines meet is the point (1,4). After you do it a few times, you will draw the lines in your head and not on paper.
Draw R. T and Y is a straight line with a line drawn through it. Put arrows on that line. Draw a large parallelogram around that and label it with a capital italics W.
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You draw a single ray and label it twice: once for the incoming ray and again for the outgoing ray.