Respuesta :

ghanami

Answer:

(-8 ; -17)

Step-by-step explanation:

hello : y=3x+7....(*)

          y=x-9....(**)

by (*) and (**) : 3x+7 = x - 9

3x-x = -7-9

2x = -16

x = -16/2 = - 8

put this value in (**) : y = -8-9 = -17