Rozwiąż układ równań dla 2x+5=3y i x+2=y

Rozwiązanie zadanego układu równań metodą podstawiania:

$\begin{cases}2x+5=3y \\ x+2=y \end{cases}$

$-3y+2x=-5y+x=-2 $
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$ctx.strokeStyle="#202020";ctx.strokeText("5",7,48);ctx.moveTo(27,48);ctx.lineTo(291,48);ctx.stroke(); $
$ctx.strokeText("4",7,72);ctx.moveTo(27,72);ctx.lineTo(291,72);ctx.stroke(); $
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$ctx.strokeText("2",7,120);ctx.moveTo(27,120);ctx.lineTo(291,120);ctx.stroke(); $
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$ctx.strokeStyle="#202020";ctx.strokeText("-1",7,192);ctx.moveTo(27,192);ctx.lineTo(291,192);ctx.stroke(); $
$ctx.strokeText("-2",7,216);ctx.moveTo(27,216);ctx.lineTo(291,216);ctx.stroke(); $
$ctx.strokeText("-3",7,240);ctx.moveTo(27,240);ctx.lineTo(291,240);ctx.stroke(); $
$ctx.strokeText("-4",7,264);ctx.moveTo(27,264);ctx.lineTo(291,264);ctx.stroke(); $
$ctx.strokeText("-5",7,288);ctx.moveTo(27,288);ctx.lineTo(291,288);ctx.stroke(); $
$ctx.strokeStyle="#202020";ctx.strokeText("-7",19,310);ctx.moveTo(27,0);ctx.lineTo(27,290);ctx.strokeStyle='#eee9e9';ctx.stroke(); $
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$ctx.strokeStyle="#202020";ctx.strokeText("-2",139,310);ctx.moveTo(147,0);ctx.lineTo(147,290);ctx.strokeStyle='#eee9e9';ctx.stroke(); $
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$ctx.strokeStyle="#202020";ctx.strokeStyle="#b22222";ctx.font="18pxArial"; $
$ctx.strokeText("x",259,310);ctx.font="11pxArial"; $
$ctx.moveTo(267,0);ctx.lineTo(267,290);ctx.strokeStyle='#eee9e9';ctx.stroke(); $
$ctx.beginPath();ctx.moveTo(289,64);ctx.lineTo(27,240);ctx.lineWidth=3;ctx.strokeStyle="#ff3399";ctx.stroke(); $
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i: Ostateczne rozwiązanie to:

x = y - 2

  2•(y -2) - 3y = -5
  - y = -1
  y = 1 
  x = y-2
  y = 1  x = (1)-2 = -1 
 {x,y} = {-1,1}