Question

x+y = 7
5x + 2y=-7

en método de suma y resta ​

Answer 1

Explicación paso a paso:

x=7-y

5(7-y)+2y= -7

35-5y+2y=-7

-3y= -7-35

-3y= -42

y= 42/3

y= 14

x = 7-14

x= -7