Question

E1. 2x+5y=5 E2. -3x+7y=36 sustitución

Answer 1

Explicación paso a paso:

2x + 5y = 5 (* 3)

6x + 15y = 15

-3x + 7y = 36 (* 2)

-6x + 14y = 72

6x + 15y = 15 (+)

-6x + 14y = 72

29y = 87

y = 87/29

y = 3

reemplazamos

2x + 5y = 5

2x + 5(3) = 5

2x = 5 - 15

2x = -10

x = -5