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2a+2b=42
b nad 2=¾ | * 4
Z drugiego równania wychodzi, że 2b = 12/4 = 3
Wstawiasz za 2b do pierwszego równania:
2a + 3 = 42
2a = 39
a = 19,5
b = 1,5
b/2=¾
2a+2b=42
2b=3
b=1.5
2a+3=42
2a=39
a=19.5
a=19.5
b=1.5
b nad 2=¾
2a + 2b = 42
½b = ¾ |*-4
2a + 2b = 42
-2b = -12/4
2a + 2b = 42
-2b = -3
2a = 39 |:2
a = 19,5
-2b = -3 |:(-2)
b = 1,5