Someone help me to make the following graph in latex. I am a beginner or practically new to latex graphics.enter image description here

  • There's an rror on this draawing: the abscissa of the intersection is not 400/45, but 4000/45=800/9.
    – Bernard
    May 31, 2021 at 20:51
  • Yes, I had that error. In the accounts I made I have 4000/45 and I just put something else. May 31, 2021 at 21:00
  • Have you looked at the pgfplots package?
    – Markus G.
    May 31, 2021 at 21:28

1 Answer 1


If you compile this:

    \coordinate (i) at (800/9,2600/27);
    \coordinate (j) at (800/9,0);
    \draw (-5,0)--(100,0);
    \draw (0,-5)--(0,125);
    \draw[thick,domain=0:100] plot (\x,{(7*\x/4-3*(\x/10)*(\x/10)/4});
    \draw[thick,domain=0:100] plot (\x,{(3*\x/4+3*(\x/10)*(\x/10)/8});
    \draw[dashed] (j)--(i);
    \node[above left] at (60,78) {$7000x-30x^2$};
    \node[above left] at (100,112) {$3000x+15x^2$};
    \node at (50,60) {$A$};
    \node at (i) {$\bullet$};
    \node at (0,0) {$\bullet$};
    \node[below left] at (0,0) {$0$};
    \node[below] at (j) {$\frac{800}9$};

you will get this:

enter image description here

  • Thank you. Could you explain to me how you did it or in what program, or what pdf's I use to do it. I really would like to learn how to make these types of graphs. May 31, 2021 at 21:55
  • I did it using TikZ. May 31, 2021 at 21:56

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