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Rozwiąż układ równań metodą podstawienia x-3y=5, 4x+5y=3​

Odpowiedź :

{x - 3y = 5

{4x + 5y = 3

{x = 3y + 5

{4(3y + 5) + 5y = 3

{x = 3y + 5

{12y + 20 + 5y = 3

{x = 3y + 5

{17y + 20 = 3

{x = 3y + 5

{17y = 3 - 20

{x = 3y + 5

{17y = -17 / : 17

{y = -1

{x = 3 * (-1) + 5

{x = 2

{y = -1