Question

Rozwiąż układy równań .
zadania w załączniku :D

Answer 1

a)

3x + 15 + 4y - 2 = 24

6x + 1 + 5y + 2 = 20

 

3x = 24 - 15 + 2 - 4y

6x + 5y = 20 - 1 - 2

 

3x = 11 + 4y

6x + 5y = 17

 

x = 11/3 + 4/3y

6(11/3 + 4/3y) + 5y = 17

 

x = 11/3 + 4/3y

66/3 + 24/3y + 5y = 17

 

x = 11/3 + 4/3y

22 + 8y + 5y = 17

 

x = 11/3 + 4/3y

13y = -5

 

x = 11/3 + 4/3y

y = -5/13

 

x = 11/3 + 4/3 · -5/13

y = -5/13

 

x = 11/3 + (-20/39)

y = -5/13

 

x = 143/39 - 20/39

y = -5/13

 

x = 123/39

y = -5/13

 

x = 3 6/39

y = -5/13

 

x = 3 2/13

y = -5/13

 

b)

2x + 10 - 5y - 10 = 40

2x - 3 - 2 - y = -12

 

2x = 40 + 5y

2x - y = -7

 

2x = 40 + 5y

40 + 5y - y = -7

 

2x = 40 + 5y

4y = -47

 

2x = 40 + 5y

y = -11,75

 

2x = 40 + (-58,75)

y = -11,75

 

2x = - 18,75

y = - 11,75

 

x = - 9,375

y = -11,75