Ответы на вопрос:
1. x = 5 ; y = - 1.
2. x = 1 ; y = 0.
Объяснение:
1.
{x + 3y = 2
{2x + 3y = 7
{x=2-3y
{2x+3y=7
2 · ( 2 - 3y ) + 3y = 7
4 - 6y + 3y = 7
4 - 3y = 7
- 3y = 7 - 4
- 3y = 3
y = - 1
x = 2 - 3 · ( - 1 ) = 2 + 3 = 5
2.
{2x - y = 2
{3x - 2y = 3
{y = - ( 2 - 2x )
{3x - 2y = 3
{y = - 2 + 2x
{3x - 2y = 3
3x - 2 · ( - 2 + 2x ) = 3
3x + 4 - 4x = 3
- x + 4 = 3
- x =3 - 4
x = 1
y = - 2 + 2 · 1 = 0
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