# What is the distance between (3, 9)  and (9,1)?

10 units

#### Explanation:

The distance formula is

$\sqrt{{\left({x}_{1} - {x}_{2}\right)}^{2} + {\left({y}_{1} - {y}_{2}\right)}^{2}}$

$\sqrt{{\left(3 - 9\right)}^{2} + {\left(9 - 1\right)}^{2}}$

$\sqrt{{\left(- 6\right)}^{2} + {\left(8\right)}^{2}}$

$\sqrt{36 + 64}$

$\sqrt{100} = \pm 10$

Since distance is a positive figure, our distance is 10 units.