Question

Resolver el siguiente sistema de ecuaciones:

(1) 7x+4y=13

(2) 5x-2y=19

Answer 1

1) 7x + 4y = 13  (2)
2) 5x - 2y = 19   (4)

14x + 8y = 26
20x - 8y = 76
--------------------
34x + 0y = 102

34x = 102
x = 102/34
x = 3

Reemplazo en 1

7x + 4y = 13
7 (3) + 4y = 13
21 + 4y = 13
4y = 13 - 21
4y = - 8
y = -8/4
y = - 2


x = 3
y = - 2