Question

Vă rog! :) Rezolvați după modelul dat, prin metoda reducerii sistemele:
Model:
a){7x-8y=-45
{-15x+13y=26→
105x-120y=675
-105x+91=182→
----------------------------
| -29y=-493
y=-493/29
y=493/29
y=17
→{y=17
{7x-8×17=-45→
{y=17
{7x-136=-45→
{y=17
{7x=-45+136→
{y=17
{x=91/7→
{y=17
{x=13
S={(13, 17)}
b){ radical 2x+radical 3y=radical8
{radical3x+radical5y=radical 12
x, y aparțin R
c){x+y=10
{x-y=2
d){-2x+3y=4
{2x-5y=2
e) {x+y=10
{x-y=2

Answer 1

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