Question

plot the points (0, 4) and (0, -9). click on the graph to plot a point. click a point to delete it.

Explanation:

Step1: Recall coordinate - point plotting rule

In a two - dimensional Cartesian coordinate system, a point is represented as $(x,y)$. For the point $(0,4)$, the $x$ - coordinate is 0 and the $y$ - coordinate is 4. So, we move 0 units along the $x$ - axis and 4 units up along the $y$ - axis from the origin $(0,0)$ and mark the point.

Step2: Plot the second point

For the point $(0, - 9)$, the $x$ - coordinate is 0 and the $y$ - coordinate is - 9. We move 0 units along the $x$ - axis and 9 units down along the $y$ - axis from the origin $(0,0)$ and mark the point.

Answer:

On the given graph, mark a point 4 units above the origin on the $y$ - axis for the point $(0,4)$ and mark a point 9 units below the origin on the $y$ - axis for the point $(0,-9)$.