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x=-25+y
3(-25+y)=2y
x=-25+y
-75+3y=2y
x=-25+y
-75=2y-3y
x=-25+y
-75=-y
x=-25+y
y=75
x=-25+75
y=75
x=50
2.
{ x/5 - y/4 = 0 *20
x/2 - y/16 = 5,5 *16
4x-5y=0 *-2
8x-y=88
-8x+20y=0
8x-y=88
22y=88
y=4
-8x+20y=0
-8x+20*4=0
-8x+80=0
-8x=-80
-x=-10
x=10
odp. x=10, y=4
{
x+ 2,5= y
x/2*6=6*y/3
{
x-y=-2,5
3x=2y
{
x-y=-2,5
3x-2y=0
{
x-y=-2,5 |*(-3)
3x-2y=0 trzeba skreślić 3x i (-3x)
-3x+3y=7,5
y=7,5
3x=2y
3x=2*7,5
3x=15 |:3
x=5
x+ 2,5= y
3x=2y
x-y=-2,5
3x-2y=0
x=-2,5+y
3(-2,5+y)-2y=0
x=-2,5+y
-7,5+3y-2y=0
x=-2,5+y
y=7,5
x=-2,5+7,5
y=7,5
x=5
x=5
y=7,5
------------
{x/5 - y/4 = 0 * 20
x/2 - y/16 = 5,5*16
4x-5y=0* (-2) to wyszlo przez pomnozenie liczb przez 20
8x-y=88 to wyszlo przez pomnozenie liczb przez 16
-8x+10y=0
8x-1y=88
9y=88/9
y=9 i 7/9
4x-5* 9 i 7/9 =0
y=9 i 7/9
4x=88/9 : 4
y=9 i 7/9
x=2 i 4/9
y=9 i 7/9