Q1.Plot three points with first coordinate equal to (-2.8) and join them.

Answer 1

since the x-coordinate is the same for all of the points, they lie on a vertical line.

So, just pick any three values for y and plot the points. For example,

(-2.8,0) (-2.8,-5) (-2.8,1.73)

Answer 2

Plot three points with first coordinate equal to (-2.8) and join them.