Question

Решить уравнение способом подстановки
1) х-4у=14
2х+7у=-17
2) 7х-у=-17
4х+3у=1
3)2х+3у=-1
9х-13у=22
Срочно
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Answer 1

1) x = 14+4x
2x+7y = -17
2×(14+4y)+7y = -17
y = -3
x = 14+4×(-3)
x = 2.

2) y = 17+7x
4x+3y = 1
4x+3×(17+6x) = 1
x = -2
y = 17+7+(-2)
y = 3

3) x = -1/2-3/2y
9x-13y = 22
9×(-1/2-3/2y)-13 = 22
y = -1
x = -1/2-3/2×(-1)
x=1