proszę o wykonanie obliczeń w załączniku
układy równań liniowych
A x = 2 +y
* 2(2+y) + y = 13
* 4 + 2y + y =13
3y = 11/:3
y=11/3
x= 6/3 + 11/3 = 17/3
B x= 2 + y
*5 - 3(2+ y )+ 2y = -4
*5 - 6+3y+2y = -4
-1 + 5y =-4
5y = -3/:5
y=-3/5
x = 2 - 3/5 = 10/5 - 3/5 = 7/5
C -x = 5 -1 + y x=-5+1-y
*7 + 4( -5+1-y ) = y-1
*7-20 + 4 -4y = y - 1
-4y-y = -1 - 7+ 20
-5y = 12/ -5
y= -12/5
x= -5+1 + 12/5 = -20/5 + 12/5 = - 8/5
D y= x -7 + 5
* 8 + x -7 + 5 = -x + 16
* x+ x = 16-8 +7 - 5
2x = 10/ 2
x=5
y = 5-7+5= -3
A)
{x-y=2
{2x+y=13
{5-3=2
{10+3=13
{2=2
{13=13
SPEŁNIA
B)
{6+x-y=8
{5-3x+2y=-4
{11-3=8
{-10+6=-4
{8=8{ -4=-4
C)
{1-x-y=5
{7+4x=y-1
{1-5-3=5
{7+20=2
{-7≠5
{27≠2
NIE SPEŁNIA
D)
{-5=x-y-7
{8+y=-x+16
{-5=5-3-7
{8+3=-5+16
{-5=-5
{11=11
Bardzo proszę. Pozdrawiam ;)
A x = 2 +y
* 2(2+y) + y = 13
* 4 + 2y + y =13
3y = 11/:3
y=11/3
x= 6/3 + 11/3 = 17/3
B x= 2 + y
*5 - 3(2+ y )+ 2y = -4
*5 - 6+3y+2y = -4
-1 + 5y =-4
5y = -3/:5
y=-3/5
x = 2 - 3/5 = 10/5 - 3/5 = 7/5
C -x = 5 -1 + y x=-5+1-y
*7 + 4( -5+1-y ) = y-1
*7-20 + 4 -4y = y - 1
-4y-y = -1 - 7+ 20
-5y = 12/ -5
y= -12/5
x= -5+1 + 12/5 = -20/5 + 12/5 = - 8/5
D y= x -7 + 5
* 8 + x -7 + 5 = -x + 16
* x+ x = 16-8 +7 - 5
2x = 10/ 2
x=5
y = 5-7+5= -3
A)
{x-y=2
{2x+y=13
{5-3=2
{10+3=13
{2=2
{13=13
SPEŁNIA
B)
{6+x-y=8
{5-3x+2y=-4
{11-3=8
{-10+6=-4
{8=8
{ -4=-4
SPEŁNIA
C)
{1-x-y=5
{7+4x=y-1
{1-5-3=5
{7+20=2
{-7≠5
{27≠2
NIE SPEŁNIA
D)
{-5=x-y-7
{8+y=-x+16
{-5=5-3-7
{8+3=-5+16
{-5=-5
{11=11
Bardzo proszę. Pozdrawiam ;)