Fsc Part 1 Mathematics (Complete Solution)

#
Q2

Repeat Q-1 when A=R,the set of real numbers.which of the real lines are functions.

**(i){(x,y) l y=x} **

Solution:

A={(x,y) l y=x} is a function.

the graph of this is shown in the figure

**(ii) {(x,y) l y+x=5}**

Solution:

B={(x,y) l y+x=5} is a function

The graph of this is shown in the figure.

**(iii) {(x,y) l x+y < 5}**

Solution:

C={(x,y) l x+y < 5} is not a function because Domain is repeated.

the graph of this is shown in the figure.

**(iv) {(x,y) l x+y>5}**

Solution:

D={(x,y) l x+y>5} is not a function because Domain is repeated.

The graph of this is shown in the figure.