The Distance Formula = [tex] \sqrt{( X_{2} - X_{1}) ^{2}+( Y_{2} - Y_{1}) ^{2}} [/tex]
A(1,1) ⇒ the first 1 is [tex] X_{1} [/tex] & the second 1 is [tex] Y_{1} [/tex] .
B(7,-7) ⇒ the first 7 is [tex] X_{2} [/tex] & the second is -7 is [tex] Y_{2} [/tex] .
Now all you have to do is SUBSTITUTE the variables into the distance formula to get: [tex] \sqrt{(7-1) ^{2}+(-7-1) ^{2}} [/tex] .
After you plug that formula into your graphing calculator (or solve it manually & mentally), you should end up with the answer 10, therefore d=10.
