Question

7x-5y=34
-9x-7y=10 nesecito resolver

Answer 1

7x -5y = 34
7x = 34 + 5y
x= 34/7 + 5y/7

usando X en la segunda ecuacion:

-9(34/7 + 5y/7) - 7y =10 
-306/7 -45y/7 - 7y = 10
-45y/7 - 7y = 10 + 306/7
y(-45/7 -7) = 376/7
y(-94/7) = 376/7
y = -376/94
y = -4

usando y = -4 en la primera ecuacion
7x - 5(-4) = 34
7x +20 = 34
7x = 34-20
7x = 14
x = 2

y = -4    ;  x= 2