Answer :
If the slope of a line is 0, then the line is parallel to the X - axis. that means value of y will be same for each value of x,
So, the value of r = 2 ( same as the one in (-5 , 2))
If the slope of a line is 0, then the line is parallel to the X - axis. that means value of y will be same for each value of x,
So, the value of r = 2 ( same as the one in (-5 , 2))