Rozwiąż metodą przeciwnych wspołczynników .
a) 5e - 2f = 8
-5e + f = -9
b) 2x + 2y = 4
x-y = 8
a)
5e - 2f = 8
5e -2f + (-5e) +f = -1
-1f = -1 | × (-1)
f = 1
5e = 8 + 2
5e = 10
e = 2
b)
2x + 2y = 4
x - y = 8 | × (-2)
-2x + 2y = -16
2x + 2y + (-2x) + 2y = -12
4y = -12
y = -3
2x = 4 - (-6)
2x = 10
x = 5
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a)