Odpowiedzi

2009-12-17T17:50:00+01:00
A) x+3y=3
x-y=5

x+3y=3
x=5 + y

5+y + 3y=3
x=5 + y
y+3y = -2
x=5 + y
4y=-2
x=5 + y
y=-1/2
x=4 1/2

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

x=17 - 5y
34-10y-y = 10
-11y = -24
y = 2 1/2
x= 4,5

c)3m+n=9
2m-5n=-11

n=9 - 3m
2m - 45 -15m = -11
-13m = 34
m=-2 8/13
n=16 11/13

d)4a-2=b
3a+7b=1,5

b= 4a - 2
3a + 28a -14 = 1,5
31a = 15,5
a=2
b=6

Pozdro
  • Użytkownik Zadane
2009-12-17T17:49:33+01:00
a)x+3y=3
x-y=5

x=-3y+3

-3y+3-y=5
-4y=-8/(-4)
y=2
b) 2x-y=10
x+5y=17

x=17 - 5y
34-10y-y = 10
-11y = -24
y = 2 1/2
x= 4,5

c)3m+n=9
2m-5n=-11

n=9 - 3m
2m - 45 -15m = -11
-13m = 34
m=-2 8/13
n=16 11/13

d)4a-2=b
3a+7b=1,5

b= 4a - 2
3a + 28a -14 = 1,5
31a = 15,5
a=2
b=6

Prosze :D