Question

(4x - 5y = -9

12x + 3y = 1​

Answer 1

Método: Sustitución

{4x - 5y = -9

{12x - 3y = 1

{4x - 5y = -9

{x = 1/12 + 1/4 × y

4(1/12 + 1/4 × y) - 5y = -9

1/3 + y - 5y = -9

1/3 - 4y = -9

-4y = -9 - 1/3

-4y = -28/3

y = 7/3

x = 1/12 + 1/4 × 7/3

x = 1/12 + 7/12

x = 2/3

(x, y) = (2/3, 7/3)

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