Szczegółowe wyjaśnienie:
[tex]\left \{ {7x+10y=36} \atop {y=2x+9}} \right.[/tex]
[tex]7x+10(2x+9)=36\\7x+20x+90=36\\27x=-54 / :27\\x = -2[/tex]
[tex]y = 2*(-2)+9\\y = -4+9\\y = 5[/tex]
[tex](x,y) = (-2,5)[/tex]
[tex]\left \{ {{7*(-2)+10*5=36} \atop {5=2*(-2)+9}} \right. \\\left \{ {{(-14)+50=36} \atop {5=(-4)+9}} \right. \\\left \{ {{36=36} \atop {5=5}} \right.[/tex]
Odpowiedź:
[tex](x,y) = (-2,5)[/tex]
