Question

X+x-y=23
x+y+y=54
y-z-z=7
y+x*z-z=?

Answer 1

Ответ:232

Объяснение:

Answer 2

Объяснение:

x+x-y = 23

2x-y = 23

y = 2x-23

x+y+y = 54

x+2y = 54

2y = 54-x

y-z-z = 7

y-2z = 7

y = 7+2z

2x-23 = 7+2z

2x = 7+2z+23

2x = 2z+30

x = (2z+30):2

x = z+15

2y = 54-x

2y = 54-(z+15)

2y = 54 - z - 15

2y = 39-z

y = (39-z):2

y = y

(39-z):2 = 7+2z

39-z = 2(7+2z)

39-z = 14+4z

-z-4z = 14 - 39

-5z = -25

z = 5

y = 7+2z = 7+2*5 = 17

x = z+15 = 5+15 = 20

y+x*z-z = 17+20*5-5 = 17+100-5 = 112

Ответ: 112.