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y-cena winogron
3x+5y=26
4x+7y=36
-12x-20y=-104
12x+21y=108
y=4
x=2
4x+7y=36/3
-12x-20y=-104
12x+21y=108
1y=4
3x+20=26
3x=6
x=2
y-winogrona
3x+5y=26 //*-4
4x+7y=36 // * 3
-12x-20y=-104
12x+21y=108
___________
y= 4 zł
3x+5 * 4 = 26
3x+20 =26
3x=6
x=2 zł