## Calculus (3rd Edition)

(a) Since both $x=1\gt 0$ and $y=2\gt 0$, then $(1,2)$ is in the first quadrant. (b) Since $x=-3\lt 0$ and $y=2\gt0$, then $(-3, 2)$ is in the second quadrant. (c) Since $x=4\gt 0$ and $y=-3\lt0$, then $(4,-3)$ is in the fourth quadrant. (d) Since $x=-4\lt 0$ and $y=-1\lt0$, then $(-4,-1)$ is in the third quadrant.