Respuesta :

y=6.4

1) Let's find out then, solving that equation.

8.6 + y = 15 Subtract 8.6 from both sides

y= 15 -8.6

y=6.4

8.6 + 6.4 = 15

15 = 15 True

2) Hence the value of y that makes it true is 6.4