Question

3X -5Y = 2 2X +7Y =-1​

Answer 1

Método: Sustitución

{3x - 5y = 2

{2x + 7y = -1

{x = 2/3 + 5/3y

{2x + 7y = -1

Para y...

2(2/3 + 5/3y) + 7y = -1

4/3 + 10/3y + 7y = -1

4/3 + 31/3y = -1

4 + 31y = -3

31y = -3 - 4

31y = -7

y = -7/31

Para x...

x = 2/3 + 5/3 × (-7/31)

x = 2/3 - 5/3 × 7/31

x = 2/3 - 35/93

x = 9/31

(x, y) = (9/31, -7/31)

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