Question

Prosze o rozwiązanie punktu e,b,f.

Answer 1

b.

6x+5y=20

2x-1/2y=2

 

-1/2y=2-2x

y=-4+4x

 

6x+5(-4+4x)=20

6x-20+20x=20

26x=40

x=40/26

 

y=-4+4*40/26

y=27/13

 

e.

12x-4+10y-15=30y+30

x+y-6y+2=x-6y

 

-5y=-2

y=2/5

12x=2*2/5+49

12x=57

x=57/12

 

f.

6x-4-2x-y=6x+1

5x+5y+x-y=1-4x

y=-5-2x

10x+4y=1

4(-5-2x)=1-10x

-20-8x=1-10x

2x=21

x=21/2

 

y=-5-2*21/2

y=-26