There are 4 quadrants on the xy-plane.
Here are the 4 points that represent the 4 quadrants:
(x, y) = quadrant 1
(-x, y) = quadrant 2
(-x, -y) = quadrant 3
(x, -y) = quadrant 4
Your point is (-3, 45), which means x is negative and y is positive.
Using the information above, (-3, 45) = (-x, y) = quadrant 2