Rozwiąż układ równań dla x=x-y/3+1 i 2=y-x

Rozwiązanie zadanego układu równań metodą podstawiania:

$\begin{cases}x=x-\frac{y}{3}+1 \\ 2=y-x \end{cases}$

$ y=3 $
$ x-y=-2 $

i: Ostateczne rozwiązanie to:

y = 3 y + x = -2


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var ctx=c.getContext("2d");
ctx.font="18px Arial";
ctx.strokeStyle = "#202020";ctx.strokeStyle = "#b22222";ctx.strokeText(" y",7,24);ctx.font="12px Arial";
ctx.moveTo(27,24);ctx.lineTo(291,24);ctx.stroke();
ctx.strokeStyle = "#202020";ctx.strokeText(" 7",7,48);ctx.moveTo(27,48);ctx.lineTo(291,48);ctx.stroke();
ctx.strokeText(" 6",7,72);ctx.moveTo(27,72);ctx.lineTo(291,72);ctx.stroke();
ctx.strokeText(" 5",7,96);ctx.moveTo(27,96);ctx.lineTo(291,96);ctx.stroke();
ctx.strokeText(" 4",7,120);ctx.moveTo(27,120);ctx.lineTo(291,120);ctx.stroke();
ctx.strokeText(" 3",7,144);ctx.moveTo(27,144);ctx.lineTo(291,144);ctx.stroke();
ctx.strokeText(" 2",7,168);ctx.moveTo(27,168);ctx.lineTo(291,168);ctx.stroke();
ctx.strokeText(" 1",7,192);ctx.moveTo(27,192);ctx.lineTo(291,192);ctx.stroke();
ctx.strokeStyle = "#202020";ctx.strokeText(" 0",7,216);ctx.moveTo(27,216);ctx.lineTo(291,216);ctx.stroke();
ctx.strokeStyle = "#202020";ctx.strokeText(" -1",7,240);ctx.moveTo(27,240);ctx.lineTo(291,240);ctx.stroke();
ctx.strokeText(" -2",7,264);ctx.moveTo(27,264);ctx.lineTo(291,264);ctx.stroke();
ctx.strokeText(" -3",7,288);ctx.moveTo(27,288);ctx.lineTo(291,288);ctx.stroke();
ctx.strokeStyle = "#202020";ctx.strokeText(" -5",19,310);ctx.moveTo(27,0);ctx.lineTo(27,290);ctx.strokeStyle = '#eee9e9';ctx.stroke();
ctx.strokeStyle = "#202020";ctx.strokeText(" -4",43,310);ctx.moveTo(51,0);ctx.lineTo(51,290);ctx.strokeStyle = '#eee9e9';ctx.stroke();
ctx.strokeStyle = "#202020";ctx.strokeText(" -3",67,310);ctx.moveTo(75,0);ctx.lineTo(75,290);ctx.strokeStyle = '#eee9e9';ctx.stroke();
ctx.strokeStyle = "#202020";ctx.strokeText(" -2",91,310);ctx.moveTo(99,0);ctx.lineTo(99,290);ctx.strokeStyle = '#eee9e9';ctx.stroke();
ctx.strokeStyle = "#202020";ctx.strokeText(" -1",115,310);ctx.moveTo(123,0);ctx.lineTo(123,290);ctx.strokeStyle = '#eee9e9';ctx.stroke();
ctx.strokeStyle = "#202020";ctx.strokeText(" 0",139,310);ctx.moveTo(147,0);ctx.lineTo(147,290);ctx.strokeStyle = '#eee9e9';ctx.stroke();
ctx.strokeStyle = "#202020";ctx.strokeText(" 1",163,310);ctx.moveTo(171,0);ctx.lineTo(171,290);ctx.strokeStyle = '#eee9e9';ctx.stroke();
ctx.strokeStyle = "#202020";ctx.strokeText(" 2",187,310);ctx.moveTo(195,0);ctx.lineTo(195,290);ctx.strokeStyle = '#eee9e9';ctx.stroke();
ctx.strokeStyle = "#202020";ctx.strokeText(" 3",211,310);ctx.moveTo(219,0);ctx.lineTo(219,290);ctx.strokeStyle = '#eee9e9';ctx.stroke();
ctx.strokeStyle = "#202020";ctx.strokeText(" 4",235,310);ctx.moveTo(243,0);ctx.lineTo(243,290);ctx.strokeStyle = '#eee9e9';ctx.stroke();
ctx.strokeStyle = "#202020";ctx.strokeStyle = "#b22222";ctx.font="18px Arial";
ctx.strokeText(" x",259,310);ctx.font="11px Arial";
ctx.moveTo(267,0);ctx.lineTo(267,290);ctx.strokeStyle = '#eee9e9';ctx.stroke();
ctx.beginPath();ctx.moveTo(289,144);ctx.lineTo(27,144);ctx.lineWidth = 3;ctx.strokeStyle = "#ff3399";ctx.stroke();
ctx.beginPath();ctx.moveTo(289,24);ctx.lineTo(27,288);ctx.lineWidth = 3;ctx.strokeStyle = "#006633";ctx.stroke();
  y = 3 
  x - (3) = -2
  x = 1
  x = 1 
  x = 1
  y = 3 {x,y} = {1,3}