Given two points:
[tex](x_1,y_{1)};(x_2,y_2)_{}[/tex]
You can use the following formula to find the distance between them:
[tex]d=\sqrt[]{(x_2-x_1)^2+(y_2-y_1)^2_{}_{}}[/tex]
Fo this case you know these two points:
[tex]\begin{gathered} \mleft(9,1\mright) \\ (8,7) \end{gathered}[/tex]
You can say that:
[tex]undefined[/tex]
