Respuesta :

x+y=-7
y= -7-x

-x+4(-7-x)=17
-x-28-4x =17
-5x-28=17
-5x=17+28
-5x=45
x = -9

y= -7-(-9)
y= -7+9
y=2

Answer:X=-9

Y=2

Step-by-step explanation:

X+y=-7

-X+4Y=17

X=-7-y

-X+4Y=17

X=-7-Y

-(-7-Y)+4Y=17

X=-7-Y

7+Y+4Y=17

5Y+7=17

5Y=17-7

5Y=10

Y=10÷5

Y=2

So,

X=-7-Y

X=-7-2

X=-9

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