Question 10088
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.