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5x+y=3
2x-4y=-1
5x+y=3 /*4
2x-4y=-1
20x+4y=3
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22x=2 /;22
x=1/11
5*1/11+y=3
5/11+y=3
y=3-5/11
y=2 całe i 11/11 -5/11
y=2 całe i 6/11
2x+1=4y
5x+y=3
rozw.
2x+1=4y
2x=4y-1 /:2
x=2y-½
5(2y-½)+y=3
10y-⁵/₂+y=3
11y-⁵/₂=3
11y=⁶/₂+⁵/₂
11y=¹¹/₂ /:11
y= ¹¹/₂×¹/₁₁
y=½
2x+1=4y
2x+1=4×½
2x=2-1
2x=1 /:2
x=½
spraw.
2x+1=4y
2×½+1=4×½
1+1=2
2=2
5×½+½=3
⁵/₂+½=3
⁶/₂=3
3=3