Question

Rezolvati prin metoda substitutiei:
{4x-3y=4
{-5x+2y=2

Answer 1

{4x-3y = 4

{-5x+2y = 2

-5x+2y = 2 => x = -2/5+2/5y

4x-3y = 4

4(-2/5+2/5y)-3y = 4

-8/5+8/5y-3y = 4

-8/5-7/5y = 4

-8-7y = -20

-7y = 28

y = -4

x = -2/5+2/5(-4)

x = -2/5-8/5

x = -2