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3x+4y=0,7 /:4
-7/6x -y= -0,2
3/4x+ y =7/40
------------------- +
-14/12x+9/12x = -8/40 +7/40
-5/12x = -1/40
x=1/40*12/5 = 3/50
3/4*3/50 +y = 7/40
y=35/200-9/200
y=26/200=13/100
Odp. x=0,06, y=0,13