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13x+14y=15
16x+17y=18
13x=15-14y
16x+17y=18
x=15/13 - 14/13 y
16(15/13 - 14/13y)+17y=18
x=15/13-14/13y
240/13-224/13y+17y=18
x=15/13-14/13y
-224/13y+221/13y=18-240/13
x=15/13-14/13y
-3/13y=-6/13
x=15/13-14/13y
y=2
x=15/13-14/13*2=15/13-28/13
y=2
x=-1
y=2
Spr.
13*(-1)+14*2= - 13+28 = 15
16* (-1) + 17*2=-16+34 = 18