Question

POMOOOOOOOOOOOOOOOOOOOCY!!!!!!!!!!!

Rozwiąż układ równań(jak ktoś ma to te zadanie są w matematyce plus niebieska okładka str 99 zad 4 cef i zad 5 abc

c)4y-x=6

17y=0

e)u=4v

5u-v=10

f)3r=s

3r+s=24

a)x+3y=3

x-y=5

b)2x-y=10

x+5y=-17

c)3m+n=9

2m-5n=-11

Answer 1

c)
4y - x = 6
17y = 0

y - x = 6
y = 0

0 - x = 6
y = 0

-x = 6
y = 0

x = -6
y = 0

e)
u = 4v
5u - v = 10

u = 4v
5 * 4v - v = 10

u = 4v
19v = 10 /:19

u = 4v
v = 10/19

u =  4 * 10/19
v = 10/19

u = 40/19
v = 10/19

f)
3r = s
3r + s = 24

3r = s
s + s = 24

3r = s
2s = 24 /:2

s = 3r
s = 12

3r = 12 /:3
s = 12

r = 4
s = 12

a)
x + 3y = 3
x - y = 5

x + 3y = 3
x = 5 + y

5 + y + 3y = 3
x = 5 + y

4y = -2 /:4
x = 5 + y

y = -1/2
x = 5 - 1/2

y = -1/2
x = 4 1/2

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

x = -17 - 5y 
2 * (-17 - 5y) - y = 10

x = - 17 - 5y
-34 - 10y - y = 10

x = - 17 - 5y
-11y = -34 + 10 /: -11

x = -17 - 5y 
-11y = -44/:(-11)

x = -17 - 5y
y = 4

x = -17 - 5 * 4
y = 4

x = - 37
y = 4

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

n = 9 - 3m
2m - 5 * (9 - 3m) = -11

n = 9 - 3m
2m - 45 + 15m = -11

n = 9 - 3m
17m = 34 / :17

n = 9 - 3m
m = 2

n = 9 - 3 * 2
m = 2

n = 3
m = 2

Answer 2

c)4y-x=6

17y=0

y=0

x=-6

e)u=4v

5u-v=10

20v-v=10

19v=10

v=10/19

u=40/19

f)3r=s

3r+s=24

6r=24

r=4

s=12

a)x+3y=3

x-y=5

x=3-3y

3-3y-y=5

-4y=2

y=-2/4=-1/2

x=9/2

b)2x-y=10

x+5y=-17

y=-10+2x

x-50+10x=-17

11x=-33

x=-3

y=-10+2*(-3)

y=-16

 

c)3m+n=9

2m-5n=-11

n=9-3m

2m-5(9-3m)=-11

2m-45+15m=-11

17m=-34

m=-2

n=9-3*(-2)

n=3