The distance between the two points can be found by using the line connecting the two points on the chart as the hypotenuse of a triangle. Then, using the Pythagorean Theorem,
a² + b² = c², where a and b are side lengths and c is the hypotenuse of the triangle, you will be able to compute the distance between the two points on the graph.
a = 3 units
b = 3 units
Therefore, using the formula shown above,
3² + 3² = c²
9 + 9 = c²
18 = c²
√18 = c
Thus, the distance between the two points is √18.
I hope this helps! Feel free to ask any questions if necessary.