Question

решить систему графическим.{х-у=5 зх-3у=15

Answer 1

{x - y = 5
{3x - 3y = 15

{-y = 5 - x
{-3y = 15 - 3x |:(-3)

{-y=5 - x
{y = -5 + x

x | 0 | 2 | x | 0 | 2 |
------------ ------------
y | 5 | 3 | y |-5 |-3 |