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If there is a line over a decimal, it means the decimal is repetitive. If you are typing it would look like this... .7
A line that is decreasing Apex
If the line has ends, then it's a line segment.
If y is equal to 2x, the graph would be a straight line going through the origin. The line would go up and to the right, and the angle at the origin has a tangent equal to 2. This angle is between 63 and 64 degrees.
In realistic sketches, the items in the sketch need to look like they do in real life. For this reason, proportion is important, both for individual items and items as they relate to other items on the sketch. For example, you would not want a very large glass with a tiny person holding it, or a person whose arms touched the floor.