Łatwe zadanie wystarczy onliczyć :
x+y=2100,8x=1,2y
x=210-y0,8[210-y]=1,2y
x=210-y168-0,8y=1,2y
x=210-y-0,8y-1,2y= -168
x=210-y-2y= -168 /:[-2]
x=210-yy=84
x=210-84y=84
x=126y=84spr.126+84=2100,8*126=100,8 1,2*84=100,8
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x+y=210
0,8x=1,2y
x=210-y
0,8[210-y]=1,2y
x=210-y
168-0,8y=1,2y
x=210-y
-0,8y-1,2y= -168
x=210-y
-2y= -168 /:[-2]
x=210-y
y=84
x=210-84
y=84
x=126
y=84
spr.
126+84=210
0,8*126=100,8 1,2*84=100,8