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

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