Question

Metoda podstawiania zaadania z klamerką x=-y x-y+6 b)y=x+3 2x+y=y c)x-4y=15 y=2x-1 x=4+1 d)-3x = 2y y=1-x

Answer 1

a)x = -y

x - y = 6

 

-2y = 6

 

y = -3

x = 3

 

b) y = x + 3

2x + y = y | 2x = 0 | x = 0

 

y=3

x=0

 

c) x - 4y = 15 | x = 15 + 4y

y = 2x - 1

 

y = 30 + 8y - 1

-7y = 29

 

y = -29/7

x = -11/7

 

d) -3x = 2y

y = 1 - x

 

-3x = 2 - 2x

-x = 2

 

x = -2

y = 3