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y - 3x = -5
obliczamy y z pierwszego równania
-y = 4 - 2x
y = -4 + 2x
podstawiamy obliczony y do drugiego równania
-4 + 2x - 3x = -5
-x = -5 + 4
-x = -1 | : (-1)
x = 1
y = -4 + 2x = -4 + 2*1 = -4 + 2 = -2
x = 1
y = -2
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sprawdzenie:
2x - y = 4
2*1 - (-2) = 4
2 + 2 = 4
4 = 4
y - 3x = -5
-2 - 3*1 = -5
-2 -3 = -5
-5 = -5