Question

The distance of P(3, 4) from the x-axis is

(a) 3 units (b) 4 units (c) 5 units (d) 1 unit

Answer 1

A pair of Cartesian coordinates (a,b) identifies the position of a point. That point is defined as being on the line x=a where it crosses the line y=b.

So by definition, that point is |b| from the X axis, and |a| from the y axis.
so the answer is 4 unit
option b is correct