Thanks!!
(-6,3)
sec A = r / x
r = sqrt [ (-6)^2 + 3^2 ] = sqrt [36 + 9 ] = sqrt (45) = 3sqrt (5)
So
sec A = 3sqrt (5) / -6 = - sqrt (5) / 2
Here's the graph : https://www.desmos.com/calculator/yicksu5tbe
