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A two-dimensional (2D) figure is a plane figure which is flat and shows one face (could have several sides) and no depth.
Straight line? If so - y=mx+c 3= (-(0.5)(5)) + c Rearrange and solve that one yourself!! Very easy.
Yes because a line can lie in many planes so one we add one point not on that line, we define a unique plane.
If two lines are parallel, then they will both have the same slope.
You cannot say any more. They can be parallel but need not be. In fact, given any one line, there are infinitely many lines that are not in the same plane, nor intersecting but are not parallel. For a simple example, picture yourself in a cuboid room. Line 1: Line joining floor to opposite wall. Line 2: Line joining wall on your left to the ceiling. These line are not coplanar, nor are they intersecting. Or another Line 2: Line joining wall on your left to wall behind you. Many more.