Question

AYUDAA XFA ES URGENTE, DOY CORONA!!!​​

Answer 1

1.

-x+7y= -7

y+3x= -1⇒y= -1-3x= -1-3·0= -1-0= -1

-x+7(-1-3x)= -7

-x-7-21x= -7

-22x-7= -7

-7+7=22x

0=22x

0=x

y= -1

x=0

2.

5x-y=16

-x-2y= -1⇒x=1-2y=1-2·(-1)=1-(-2)=1+2=3

5(1-2y)-y=16

5-10y-y=16

5-11y=16

5-16=11y

-11=11y

-1=y

x=3

y= -1