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2010-03-08T20:36:21+01:00
3y=6x+12 | :3
7x=5y

y=2x+4
y=7/5x

y=2x+4
y=1 2/5x
2010-03-08T20:41:33+01:00
{3y=6x+12
7x=5y

{y=2x+4
7x=5(2x+4)
7x=10x+20
7x-10x=20
-3x20
x=-20/3
y=2(-20/3)+4
y=-40/3+4
y=-13 1/3 +4
y=-9 1/3 =-28/3

x=-20/3
y=-28/3

Spr.
7x=5y
7*(-20/3)=5*(-28/3)
-140/3=-140/3

pozdrawiam:)