[latex] left { {{5y=2} atop {x+y=2 frac{2}{5} }} ight. [/latex] a) [latex] left { {{y=2 frac{2}{5} - x} atop {5y=2}} ight.[/latex] [latex]left { {{y=2 frac{2}{5}-x} atop {5*(2 frac{2}{5}-x)=2}} ight.[/latex] [latex] 12-5x=2 -5x=2-12 -5x=-10 /:(-5) x=2[/latex] [latex] left { {{x=2} atop {y=2 frac{2}{5}-x}} ight. left { {{x=2} atop {y=2 frac{2}{5}-2}} ight. left { {{x=2} atop {y= frac{2}{5} }} ight. [/latex] b)[latex] left { {{4y-x=6 /:(-1)} atop {17y=0}} ight. left { {{-4y+x=-6 } atop {17y=0}} ight. left { {{x=-6+4y} atop {17y=0}} ight. left { {{x=-6+4y} atop {17*(-6+4y)=0}} ight. -102+68y=0[/latex] [latex] 68y=0+102 68y=102 /:68 y=1.5[/latex] [latex] left { {{y=1.5} atop {x=-6+4y}} ight. left { {{y=1.5} atop {x=-6+4*1.5}} ight. left { {{y=1.5} atop {x=-6+6}} ight. left { {{y=1.5} atop {x=0}} ight. [/latex] c)[latex] left { {{3r=s} atop {3r+s=24}} ight. left { {{s=3r} atop {3r+s=24}} ight. left { {{s=3r} atop {3r+3r=24}} ight. 6r=24 /:6 r=4 left { {{r=4} atop {s=3r}} ight. left { {{r=4} atop {s=3*4}} ight. left { {{r=4} atop {s=12}} ight. [/latex] LICZĘ NA NAJ
