Hey there! I'm happy to help!
Here's how to find the distance between any two points.
Subtract the x values.
8-9=-1
Square it.
-1²=1
Subtract the y values.
10-3=7
Square it.
7²=49
Add the two numbers you got.
49+1=50
And find the square root.
√50≈7.1.
Have a wonderful day! :D