Question

se x + y = 15 e x - y = 1 ,entao o valor de x^ - y^ e ?

Answer 1

x+y= 15
x-y= 1

x= 15-y

x-y= 1
(15-y)-y= 1
-2y= 1-15
-2y= -14 . (-1)
y= 14/2
y= 7.

x= 15-y
x= 15-7
x= 8.

se for: x^2-y^2= ?

8^2-7^2=
64-49
15.

Answer 2

Resposta:

x+y=15

x-y=1

2x=16

x=16÷2

x=8

x+y=15

8+y=15

y=15-8

y=7

Explicaçl