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{3(x-2y)+4(x+y)=5
2x+2y-x+y=4
3x-6y+4x+4y=5
x+3y=4
7x-2y=5
x=4-3y
7x-2y=5
7(4-3y)-2y=5
28-21y-2y=5
28-21y-2y=5
-23y=-23 /: -23
y=1
x+3*1=4
x=4-3
x=1
y=1
b) {x-2y=-14
{2y-y=-10
y=-10
x-2*-10=-14
x+20=-14
x=-34
y=-10
PHYSYSX S.A. PHYSYSX S.A. PHYSYSX S.A. PHYSYSX S.A.