Rozwiąż podane układy równań metodą przeciwnych współczynników.
a)
x + 2y = -2
2x - y = 1
b)
x + 4y = -2
3x - 8y = 10
rozwiazanie w zalaczniku
x + 2y = -2 /·(-2)
-2x-4y = 4
2x-y = 1
___________
-5y = 5 /:(-5)
y = -1
2x-(-1) = 1
2x+1 = 1
2x = 1-1
x = 0
x + 4y = -2 /·2
2x+8y = -4
3x-8y = 10
________________
5x = 6 /:5
x = 6/5
6/5+4y = -2
4y = -2-1 1/5
4y = -3 1/5 /:4
y = -16/5·1/4
y = -4/5
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rozwiazanie w zalaczniku
a)
x + 2y = -2 /·(-2)
2x - y = 1
-2x-4y = 4
2x-y = 1
___________
-5y = 5 /:(-5)
y = -1
2x-(-1) = 1
2x+1 = 1
2x = 1-1
x = 0
b)
x + 4y = -2 /·2
3x - 8y = 10
2x+8y = -4
3x-8y = 10
________________
5x = 6 /:5
x = 6/5
6/5+4y = -2
4y = -2-1 1/5
4y = -3 1/5 /:4
y = -16/5·1/4
y = -4/5