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2014-02-14T16:37:01+02:00
5x+4y=17  |*2
10x+8y=34

4x+5y=17
5x+4y=15   |+
9x+9y=32

4x+5y=17
5x+4y=15   |-
y-x=2   |*9
9y-9x=18

9y-9x=18
9y+9x=32    |+
18y=50

y=50/18=25/9
y=2,(7)

y-x=2
25/9-x=2
x=7/9
x=0,(7)

2x+7y=2*25/9+7*7/9=50/9+49/9=99/9=11

2x+7y=11