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2009-12-09T22:39:58+01:00
½x - ¾y = 0
⅔x - 1¼y = 9

1/2x=3/4y /*2
2/3x-1 1/4y=9

x=3/2y
2/3*3/2y-1 1/4y=9

x=3/2x
-3/4y=9 /*(-4)

x=3/2x
3y=-36 /:3

x=3/2*-12
y=-12

x=-18
y=-12


3x + 4y = 1⅔
6x + 3y= 1¼

x=(5/3-4y)/3 to całe dzielone przez 3
6*(5/4-4y)/3 +3y=5/4

x=(5/3-4y)/3
-8y+3y=5/4-10/4

x=(5/3-4y)/3
-5y=5/4 /:(-5)

x=(5/3-4*(-1/4))/3
y=-1/4

x=8/9
y=-1/4