The obstacle course is set up as a grid, like a giant coordinate plane. the place where helena begins is the starting point, or the origin (0,0). north is along the positive y-axis, east is the positive x-axis, south is the negative y-axis, and west is the negative x-axis.

west of checkpoint a, which is located at (0,5), there are two hurdles that helena needs to jump over. hurdle 1 is located 4 units west of checkpoint a, and hurdle 2 is located 3 units west of hurdle 1. checkpoint b is located 2 units west of hurdle 2.

what are the coordinates of checkpoint b?