Question

Системи рівннянь 2х+5у=0 -8х+15у=7

Answer 1

2х+5у=0 -8х+15у=7;

2х=-5у -8х+15у=7;

х=-2,5у -8х+15у=7;

х=-2,5у -8(-2,5у)+15у=7;

х=-2.5у 35у=7;

х=-0.5 у=0.2