Which coordinate of a point on the $y$-axis is zero?

In which quadrant or on which axis does each of the following points lie?
$A(15, -10), B(-10, -20), C(25, 0), D(-15, 25), E(-5, 0), F(0, -15), G(25, 5), H(0, 15)$
Verify your answer by plotting the points in the Cartesian plane. Use the scale $1 \, cm = 5 \, \text{units}$ on both axes.

Which quadrant does the interior of $\angle X^{\prime}OY^{\prime}$ represent?

Plot the points $A(1, -1)$ and $B(4, 5)$.
$(i)$ Draw a line segment joining these points. Write the coordinates of a point on this line segment between the points $A$ and $B$.
$(ii)$ Extend this line segment and write the coordinates of a point on this line which lies outside the line segment $AB$.

Plot the following points and check whether they are collinear or not:
$(1,3), (-1,-1), (-2,-3)$

In which quadrant does a point lie if its coordinates have opposite signs?