Question

sistema de ecuacion
x+y=7
5x-2y=-7​

Answer 1

x+y=7
y=7-x

5x-2(7-x)=-7
5x-14+2x=7
7x=7-14
7x=-14
x=-14/7
x=-1

1+y=7
y=7-1
y=6

x=-1
y=6


Espero que te sirva :)