Question

Find the distance between the pair of points:(9, 1) and (2, -1)

Answer 1

Label your points as
\[(x_1,y_1);(x_2,y_2)\]
The distance formula is
\[\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}\]

Answer 2

x^2 + y^2 = d^2 ; square root both sides to get:

d = sqrt(x^2 + y^2)