Question

ecuaciones lineales ayuda

7x -4y=5

9x+8y=13




5x+7y= -1

-3x+4y= - 24

Answer 1

7x - 4y = 5 (2) 5x + 7y = -1(3)

9x + 8y = 13 -3x + 4y = -24(5)

14x - 8y = 10 15x + 21y = -3

9x + 8y = 13 -15x + 20y = -120

——————— ——————————

23x = 23 41y = -123

x = 23/23 y = 123/41

x = 1 y = 3