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2009-10-01T20:54:28+02:00
X+3y=12
2x-y=3

x=-3y+12
2*(-3y+12)-y=3

x=-3y+12
-6y+24-y=3

x=-3y+12
-7y=-24+3

x=-3y+12
-7y=-21 /: (-7)

x=-3y+12
y=3

x=-3*3+12
y=3

x=3
y=3
2009-10-01T21:24:19+02:00
X+3y=12
2x-y=3
x=12-3y
2×(12-3y)-y=3
24-6y-y=3
-6y-y=3-24
-7y=-21/÷(-7)
y=3
x=12-3×3
x=12-9
x=3

x=3
y=3