(Q7)What is the distance between (0,-3) , (0,-8) and justify that the distance between two points on Y-axis is |y2-y1| on coordinate plane.

As the given two points lie on Y-axis distance between them is

|y2 - y1| = |-+| = || = units

Let (0,y1) and (0,y2) be any two points on Y-axis, then distance between them

= √((0 - 0)2 + (y2 - y1)2)

= √(0+(y2 - y1)2)

= √(y2 - y1)2

= |y2 - y1|

[distance cant be negative]