How do I plot three points on a graph if the first coordinate is equal to (-2.8) and the other two coordinates are unknown?
no way. To plot a point, you have to know the coordinates, or have a way to calculate them.
(-2.8,0)
(-2.8,1)
(-2.8,2)
maths
To plot three points on a graph, you need the x-coordinates and y-coordinates for each point. In this case, you have the x-coordinate (-2.8) for the first point, but the y-coordinates are unknown.
To find the y-coordinates, you need more information. It could be given in the problem statement or you may need to calculate it based on a formula or data.
If you have additional information, please provide it so that I can guide you on how to plot the three points accurately on a graph.