Question

• 21 = 92 - 12y
-
21=9y-12y

Answer 1

Explicación paso a paso:

21 = 92 - 12y

12y = 92 - 21

12y = 71

y = 71/12

y = 5,91

-

21=9y-12y

12y - 9y = - 21

3y = - 21

y = -21/3

y = - 7