[latex]left { {{frac{2x-y+3}{3}-frac {x-2y+3}{4} =4 |*12 } atop {frac{3x-4y+3}{4}+ frac{4x-2y-9}{3}=4|*12}} ight \ left { {{4(2x-y+3)-3(x-2y+3) =48} atop {3(3x-4y+3)+ 4(4x-2y-9)=48}} ight \ left { {{8x-4y+12-3x+6y-9 =48} atop {9x-12y+9+ 16x-8y-36=48}} ight \ left { {{5x+2y=45} atop {25x-20y=75|:5}} ight \ left { {{5x+2y=45} atop {5x-4y=15}} ight \ 2y + 4y = 45 - 15\ y = frac{30}{6} = 5\ x = frac{45 - 2y}{5} = frac{45 - 10}{5} = 7 [/latex] jak masz pytania to pisz na pw
2x-y+3/3-x-2y+3/4=4 /*12 3x-4y+3/4+4x-2y-9/3=4/*12 8x-4y+12-3x+6y+9=48 9x-12y+9+16x-8y-36=48 5x+2y=45 25x-20y=75/:5 5x+2y=45/*2 5x-4y=15 10x+4y=90 5x-4y=15 _________ 15x=105/:15 x=7 x=7 5*7-4y=15 x=7 -4y=-20/:(-4) x=7 y=5
