Odpowiedzi

2010-03-10T20:44:17+01:00
1]
2x-y=10
x+5y=-17

y=2x-10
x+5(2x-10)=-17

x+10x-50=-17
11x=-17+50
11x=33
x=33:11
x=3

y=2×3-10=-4
2]
5x+2y=4
4x+y=3

y=3-4x
5x+2(3-4x)=4

5x+6-8x=4
-3x=4-6
-3x=-2
x=2:3
x=⅔
y=3-4×⅔=3-⁸/₃=⅓
3]
2x-y=10
2x+5y=-5

y=2x-10
2x+5(2x-10)=-5

2x+10x-50=-5
12x=-5+50
12x=48
x=48:12
x=4

y=2×4-10=-2
1 2 1
2010-03-10T20:46:01+01:00
1.
{2x-y=10 /5
{x+5y=-17

{10x-5y=50
{x+5y=-17
11x=33 /:11
x=3
3*2-y=10
-y=10-6 /*(-1)
y=-4

2.
{5x+2y=4
{4x+y=3 /*(-2)

{5x+2y=4
{-8x-2y=-6
-3x=-2/:(-3)
x=⅔
y=3-4*⅔=3-2⅔=⅓

3.
{2x-y=10 /*5
{2x+5y=-5

{10x-5y=50
{2x+5y=-5
12x=45 /:12
x=3,75
-y=10-2*3,75 /*(-1)
y=-2,5

Mam nadzieję, że pomogłam pozdrawiam
2010-03-10T20:49:12+01:00
1.

y = -60
x = 3

2.

x = 1,5
y = -1,75

3.
y = -2 1/5
x = 3,75