rozwiąż układ równan metodą podstawiania.:
{3x+2y+9=0 < ------------
{2x+3y+1=0 < --------------- to jest jeden caly przyklad tylko nie umialam zrobic jednego duzego nawiasu
{x+3y=8x-8y <------------------tu tak samo
{7x-13=12y-20
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{3x+2y+9=0
{2x+3y+1=0
{3x+2y+9=0
{2x+3y+1= 3x + 2y + 9
3x + 2y + 9 = 0
y = x + 8
3x + 2*(x+8) + 9 = 0
y = x + 8
3x + 2x + 16 + 9 = 0
y = x + 8
5x = -25
y = x+8
x = -5
y = -5 + 8
x = -5
y = 3
{ x + 3y = 8x - 8y
{7x - 13 = 12y - 20
11y = 7x
7x = 12y - 7
11 y = 12y - 7
7 = y
11 * 7 = 7x
11 =x
3x+2y+9=0
2x+3y+1=0
3x+2y=-9 |:3
2x+3y=-1
x+2/3y=-3 |-2/3y
2x+3y=-1
x=-3-2/3y
2(-3-2/3y)+3y=-1
x=-3-2/3y
-6-4/3y+3y=-1
x=-3-2/3y
5/3y=5 |:5/3 czyli *3/5
x=-3-2/3y
y=3
x=-3-2/3*3
y=3
x=-3-2
y=3
x=-5
y=3
2.
x+3y=8x-8y
7x-13=12y-20
11y=7x |:7
7x-12y=-7
x=11/7y
7*11/7y-12y=-7
x=11/7y
11y-12y=-7
x=11/7y
-y=-7
x=11/7y
y=7
x=11/7*7
y=7
x=11
y=7