1) [latex] left { {{-3x+4y=7} atop {2x-3y=-6}} ight. [/latex] [latex] left { {{-6x+8y=14} atop {6x-9y=-18}} ight. [/latex] - 6x + 8y + 6x - 9y = 14 - 18 - y = - 4 y = 4 2x = - 6 + 3y = - 6 +3*4 = - 6 + 12 = 6 x = 3 [latex] left { {{x=3} atop {y=4}} ight. [/latex] 2) [latex] left { {{3x-4y=7} atop {-2x+3y=-4}} ight. [/latex] [latex] left { {{6x-8y=14} atop {-6x+9y=-12}} ight. [/latex] 6x - 8y - 6x + 9 y = 14 - 12 y = 2 3x = 7 + 4y = 7 + 4*2 = 7 + 8 = 15 x = 5 [latex] left { {{x=5} atop {y=2}} ight. [/latex]
-3x+4y=7 /*2 2x-3y=-6 /*3 -6x+8y=14 6x-9y=-18 -y=-4 /:(-1) y=4 2x-3*4=-6 2x-12=-6 2x=6 /:2 x=3 zad2 3x-4y=7 /*2 -2x+3y=-4 /*3 6x-8y=14 -6x+9y=-12 y=2 3x-4*2=7 3x=7+8 3x=15 /:3 x=5
