Respuestas

2012-10-25T05:01:08+02:00

7x-4y=5.... ..... --> y = (5-7x)/(-4)

9x+8y = 13 ... --> y = (13-9x)/8

Igualacion:

(5-7x)/(-4) = (13-9x)/8

40 - 56x = -52 + 36x

92 = 92 x

x = 1

y = (13 - 9(1) ) / 8
y = 4 / 8

y = 1/2

7x-4y=5 --> 7(1) - 4(1/2) = 5

9x+8y = 13 --> 9(1) + 8 (1/2) = 13