Question

1 Resolva o sistema de equações:
3x + 4y = 5
-2x + 2y = 3

Answer 1

{3x + 4y = 5

{- 2x + 2y = 3 ⟶ - 2x = 3 - 2y ⟶ x = - 3/2 + y

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

- 9/2 + 3y + 4y = 5

- 9/2 + 7y = 5

7y = 5 + 9/2

7y = 19/2

y = (19/2)/7

y = 19/14

x = - 3/2 + 19/14

x = (- 21 + 19)/14

x = (- 2)/14

x = - 2/14

x = - 1/7

S = {(x , y) = (- 1/7 , 19/14)}

att. yrz