Question

What is the straight-line distance between(6,3) and (4,-5) on a coordinate graph

Answer 1

$\sqrt{( x_{2} -x_{1} )^2+( y_{2} -y_{1} )^2}$

and now substituting the your values:
 $\sqrt{( 6-4 )^2+( 3-(-5) )^2}$

we get that the distance is=$2 \sqrt{17}$
                                         =8.25(3 sig.fig)