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a=x
b=x-2
2x+2(x-2)=76,4
2x+2x-4=76,4
4x=76,4+4
4x=80,4 /:4
x=20,1
a=x=20,1
b=x-2=20,1-2=18,1
a=20,1
b=18,1
a+2=b
2a+2b=76.4
a-b=-2 /*2
2a+2b=76.4
2a-2b=-4
dodajemy stronami:
2a+2b+2a-2b=76.4-4
4a=72.4
a=18.1
2*18.1+2b=76.4
2b=76.4-36.2
2b=40.2
b=20.1