Question

A square has two sides on the lines x = 3 and y = 1. It has a vertex at (12,-8). What is the perimeter, in units, of the square?

Answer 1

The point (12,-8) has the x coordinate of x = 12
Going from x = 3 to x = 12 is a distance of 9 since 12-3 = 9

Therefore this square has a side length of 9 units
There are 4 of these congruent (same length) sides, so 4*9 = 36 is the perimeter

Answer: B) 36
Note: you can use the y coordinate if you want. The distance from y = 1 to y = -8 is also 9 units because 1-(-8) = 1+8 = 9