Respuesta :

osakings641

Answer:

x= -1

y= -9

Step-by-step explanation:

7x-3y=20 × -1 ......(1)

-5x+y=-4 × +3.......(2)

7x-3y=20

-15x+3y=-12

__________

-8x =8

x= 8 ÷ -8 = -1

x= -1

putting x into equation 2

y = 5x-4

y =5(-1) - 4

y = -5 - 4

y = -9