Rozwiąż układ metodą rachunkową.
{2x + y = -1
{x - 3y = -18
{2x + y = -1 /*3
6x + 3y = -3
x - 3y = -18
-------------------
7x = -21
x = -3
-3 - 3y = -18
-3y = - 18 + 3
-3y = -15
y = 5
{x - 3y = -18 -> x = -18 + 3y
2*(-18 + 3y) + y = -1
-36 + 6y + y = -1
7y = -1 + 36
7y = 35
x = -18 + 3y
x = -18 + 3 * 5
x = -18+ 15
{x = -3
{y = 5
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{2x + y = -1 /*3
{x - 3y = -18
6x + 3y = -3
x - 3y = -18
-------------------
7x = -21
x = -3
x - 3y = -18
-3 - 3y = -18
-3y = - 18 + 3
-3y = -15
y = 5
x = -3
y = 5
{2x + y = -1
{x - 3y = -18 -> x = -18 + 3y
2*(-18 + 3y) + y = -1
-36 + 6y + y = -1
7y = -1 + 36
7y = 35
y = 5
x = -18 + 3y
x = -18 + 3 * 5
x = -18+ 15
x = -3
{x = -3
{y = 5