rozwiąż układ równań:
(7x+y=5
(5x+2y=1
dziękuję bardzo ;)
(
( - klamra XD
{ 7x + y = 5 [x (-2)
*{5x + 2y = 1
{ -14x - 2y = -10
{5x + 2y = 1
-----------------
+ -9x = -9 [:(-9)
x = 1
* 5x + 2y = 1
5 + 2y = 1
2y = - 4 [:2
y = -2
{x=1
{y=-2
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{ 7x + y = 5 [x (-2)
*{5x + 2y = 1
{ -14x - 2y = -10
{5x + 2y = 1
-----------------
+ -9x = -9 [:(-9)
x = 1
* 5x + 2y = 1
5 + 2y = 1
2y = - 4 [:2
y = -2
{x=1
{y=-2