Question

13x+5y=88
13x-7y=64

Answer 1

Respuesta:

13x+5y=88

13x+5y-88=88-88

13x+5y-88=0

13x-7y=64

13x-7y-64=64-64

13x-7y-64=0

Answer 2

13 + 5y = 88
-13x + 7y = -64
2y = 24
y = 24/2
y = 12

13x + 5 x 12 = 88
13x + 60 = 88
13x = 28
x = 28/13
x= 2,15