metoda podstawiania , rozwiąż :2a + b = 48 a = b + 3
{2a + b = 48 {a = b + 3
2( b + 3) + b = 48
2b + 3 + b = 48
3 b + 3 = 48
3 b = 45
b = 15
a = 15 + 3
a = 18
2a+b=48
a=b+3
48-3=3a
3a=45/:3
a=15
b=15+3=18
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{2a + b = 48
{a = b + 3
2( b + 3) + b = 48
2b + 3 + b = 48
3 b + 3 = 48
3 b = 45
b = 15
a = 15 + 3
a = 18
2a+b=48
a=b+3
48-3=3a
3a=45/:3
a=15
b=15+3=18