(0,0) is the starting point because no time has passed and no distance ... Find 18 on the x axis and draw a vertical line to the graph, from here draw a horizontal line to the y axis.

The graph of \(y = 2x + 1\) crosses the \(y\)-axis at (0, 1 ... positive – going up negative – going down zero - no change (a flat line) Steep lines will have high gradients like 5 or ...