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In the case that you are using Slope-Intercept Form, no, you only plot two points: the y-intercept and one other point. If you don't use Slope-Intercept Form, then you have to use three points.
Yes
by eating a bana and yes
You do not have to plot it first but it is a point whose location is sometimes easy to find.
Plot its straight line equation on the Cartesian plane