Найдите решение системы уравнений методом подстановки.
{х+у=5
{-3х+5у=9
А.(2;3)
Б.(-2;7)
В.(-2;3)
Г.(8;3)
{х+у=5
{-3х+5у=9
А.(2;3)
Б.(-2;7)
В.(-2;3)
Г.(8;3)
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Verified answer
Х + y = 5- 3x + 5y = 9
Решение
у = 5 - Х
- 3х + 5( 5 - Х ) = 9
- 3х + 25 - 5х = 9
- 8х = - 16
Х = 2
у = 5 - 2 = 3
Ответ ( 2 ; 3 )