Respuesta :

julisaa46

Answer:

7

Step-by-step explanation:

15-8=7 this is how you answer it

mamata6

Answer:

11.5 and 3.5

Step-by-step explanation:

a+b=15

a-b=8

equating them we get,

2a=23

a=11.5

placing value of b in a-b=8

11.5-b=8

b=3.5