{2x + 4y = 5 {4x - 8y = 4

{2x + 4y = 5 / *(-2) {4x - 8y = 4 {-4x -8y = -10 + {4x -8y = 4 ------------------------- -16y= -6 / ÷ (-16) y= ⅜ -4x -8 * ⅜ = -10 -4x - 3 = -10 -4x = -10 +3 -4x= -7 /÷ (-4) x= 7/4 {x=7/4 {y=3/8

{2x + 4y = 5 /*2 {4x - 8y = 4 4×+8y=10 4x-8y=4 y się skrocą i zostaje 8x=14 czyli x=14/8 czyli 7/4 czyli 1 ¾ y=2*1¾+4y=5