Question 633151
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Hi,
So good to hear you are using www.padowan.dk/graph 
To get an accurate look at the slope, one need to use the same range for x and y.
In order to see where the line crosses the x-axis, am using the range -300,300 for both x and y-values of the Axes.
P = .15x -28    || As in y = mx + b, where m is the slope and b the y-intercept
m = .15
{{{drawing(300,300,   -300,300,-300,300,  grid(1),
graph( 300, 300, -300,300,-300,300,0,.15x-28))}}}
If one uses for ex -100, 100 for the y-values, that's ok ... just that then the
graph at first glance appears to say y is increasing 'faster' so to speak.
{{{drawing(300,300,   -300,300,-100,100,  grid(1),
graph( 300, 300, -300,300,-100,100,0,.15x-28))}}}
As to Your other questions: You did not say if P represents profit in 1000s?
Many times that is used.  or if x represents how many thousands are made...
One needs to know what exactly the x and P represent