Rozwiąż układ równań:
6a+9b=126
2a+2b+12=54
2a+3b=42 a+b=29-6 a+b=23 a=23-b
a+b+6=29 a+b=23 b=23-a
2a+2b+12=54 /*-36a+9b=126-6a-6b-36=-1626a+9b=126-6a-6b=-126____________3b=0 /3b=0a=21
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2a+3b=42 a+b=29-6 a+b=23 a=23-b
a+b+6=29 a+b=23 b=23-a
6a+9b=126
2a+2b+12=54 /*-3
6a+9b=126
-6a-6b-36=-162
6a+9b=126
-6a-6b=-126
____________
3b=0 /3
b=0
a=21