Question

resolva a conta: X + Y = - 77
6 X - Y = 140

Answer 1

X + Y = - 77
6 X - Y = 140

7x=63

x=63/7

x=9

y=-77-x

y=-77-9

y=-83

espero ter ajudado!

Answer 2

resolução!

x + y = - 77

6x - y = 140

7x = 63

X = 63/7

X = 9

y = - 77 - x

y = - 77 - 9

y = - 86

S = { x = 9 e y = - 86 }