You can
put this solution on YOUR website!right, you need to graph them, ie plot them.
So forget the y=mx+c approach..this just tells you the info like gradient, but that doesn't help you plot the actual lines.
Answer the following:
1. have you been told what values of "x" and "y" to plot?
2. Negative "x" values?
if not, then use your own initiative and pick a valid spread of "x" values... try 0 to 10 perhaps?
Draw your axes
As these are straight lines, you only need pick 2 points on both lines and just join them, so pick x=0 and x=10 (if you use this spread).
The thing to be aware of is that 2 lines like this are boring as hell except where they cross, because that means something both mathematically and in your case economically, so x=0 to x=10 may not be the correct spread to include the crossover point, so trial and error is needed by you :-)
Enjoy
jon.
