Plot the function y = 2x + 1. Find the value of the function from the graph at the value of the argument: -1; 0; 2.

The graph of this function will be a straight line. In order to build this graph, you need to find the coordinates of two points through which this straight line will pass.
You need to take some value of the argument x1 = – 2, so y1 = 2 * (-2) + 1 = -3;
Let x2 = 0, then y2 = 2 * 0 + 1 = 1.
First, we build a coordinate system and mark the points (-2; – 3) and (0; 1) on it.
Using this graph, we find when x = -1, then y = -1;
If x = 0, then y = 1;
If x = 2, then y = 5.