| 1 | initial version |
You can solve this by hand and plot or by Sage and plot as follows:
ans=solve(20*x+10000==80*x,x)
x0=ans[0].rhs()
y0=80*x0
p3=point( (x0,y0), size=40)
p9=p1+p2+p3
show(p9)
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