Реши уравнения:9х-2х=84 (9-2)х=84 7х=84 6у+3у=486 (6+3)у=486 9у=486

Question

Реши уравнения:
9х-2х=84 (9-2)х=84 7х=84 6у+3у=486 (6+3)у=486 9у=486

Answer 1

1) 9х-2х=84
    7x=84
    x=12
2) 6y+3y=486
    (6+3)y=486
    9y=486
     y=54

Answer 2

9х-2х=84.....7х=84.......84/7=12
 (9-2)х=84 ......7х=84.........84/7=12
7х=84 .......84/7=12
6у+3у=486........9у=486......у=486/9=54
(6+3)у=486.........9у=486.........у=486/9=54
9у=486......у=486/9=54