Graph the following inequalities X ySolution20 We will plug

Solution

20.

We will pluggin x=0 and y=0 in the inequalities given in problem 18 and 19 and then check whether the condition is true or not.

for 18....

x+y< 4

=> 0+0 < 4

=> 0<4 , this is true hence (0,0) lies in the solution set.

for 19..

y-1 <= 1(x-2)

=> 0 -1 <= (0-2)

=> -1 <= -2, this is false hence (0,0) is not in the solution set.