Hey there, you can solve this using the distance formula!
[tex]Distance = \sqrt{(x_{2}- x_{1})^2+(y_{2}- y_{1})^2} [/tex]
Where [tex] x_{1} [/tex] = 10
[tex] x_{2} [/tex] = 2
[tex] y_{1} [/tex] = 7
[tex] y_{2} [/tex] = 7
So...
[tex]Distance = \sqrt{(2- 10)^2+(7- 7)^2}[/tex]
[tex]Distance = \sqrt{(-8)^2+(0)}[/tex]
[tex]Distance = \sqrt{64} [/tex]
Distance = 8 units
