prosze pomocy za najlepsze daje naj
1.{ x + y = 1
{2x + 3y = 0
2.6x + 2y = 8
2y = 8 - 6x
y = 4 - 3x
3.x = 3
y = 1
4.{x - 2y = -11
{3x + 4y = 7
x = -3
y = 4
{-3 - 2*4 = -11
{ 3*(-3) + 4*4 = 7
{-11 = -11
{7 =7 - Odp.: Dana para liczb jest rozwiązaniem układu.
5. * {x = -y
{x - y = 12
{x = -y
- y - y =12
-2y = 12 [:(-2)
y = -6
* x = - y
x = -(-6)
x = 6
{x = 6
{y = -6
6.{ x + y = 120
{ 0,5x +1,5y = 140 [*10
*{x + y = 120 [*(-5)
{ 5x + 15y = 1400
{-5x - 5y = -600
--------------------------
+ 10 y = 800 [:10
y = 80
* x + y = 120
x + 80 = 120
x = 40
{x = 40 - ilość mnejszych kartonów
{ y = 80 - ilość większych kartonów
7.
*{3x + 2y = 2
{1,5x + 6y = 21 [*10
{3x + 2y = 2 [*(-5)
{ 15x + 60y = 210
{-15x - 10y = -10
{ 15x +60y = 210
+ 50y = 200 [:50
* 3x + 2y = 2
3x + 8 = 2
3x = -6 [:3
x = -2
{x = -2
{y = 4
8.np. 2x - 5y = 5
9. { x[2] - 25 = 0
{ 2x - y = 0
{x[2] = 25
{x = 5
{10 - y = 0
{y = 10
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1.{ x + y = 1
{2x + 3y = 0
2.6x + 2y = 8
2y = 8 - 6x
y = 4 - 3x
3.x = 3
y = 1
4.{x - 2y = -11
{3x + 4y = 7
x = -3
y = 4
{-3 - 2*4 = -11
{ 3*(-3) + 4*4 = 7
{-11 = -11
{7 =7 - Odp.: Dana para liczb jest rozwiązaniem układu.
5. * {x = -y
{x - y = 12
{x = -y
- y - y =12
-2y = 12 [:(-2)
y = -6
* x = - y
x = -(-6)
x = 6
{x = 6
{y = -6
6.{ x + y = 120
{ 0,5x +1,5y = 140 [*10
*{x + y = 120 [*(-5)
{ 5x + 15y = 1400
{-5x - 5y = -600
{ 5x + 15y = 1400
--------------------------
+ 10 y = 800 [:10
y = 80
* x + y = 120
x + 80 = 120
x = 40
{x = 40 - ilość mnejszych kartonów
{ y = 80 - ilość większych kartonów
7.
*{3x + 2y = 2
{1,5x + 6y = 21 [*10
{3x + 2y = 2 [*(-5)
{ 15x + 60y = 210
{-15x - 10y = -10
{ 15x +60y = 210
--------------------------
+ 50y = 200 [:50
y = 4
* 3x + 2y = 2
3x + 8 = 2
3x = -6 [:3
x = -2
{x = -2
{y = 4
8.np. 2x - 5y = 5
9. { x[2] - 25 = 0
{ 2x - y = 0
{x[2] = 25
{ 2x - y = 0
{x = 5
{10 - y = 0
{x = 5
{y = 10