Question

Rozwiąż układy równań:

a) 2(x-3)+3(y-5)=4(x-1)-3(y-7)

2(x+y)-5(y-x)=3(2x-y)+5(5x-3y)

b)-3(x-y)+8(2x+y)=3(x+2y)-5(x+y)

-2(x-3)+6(y+4)=3(x+1)-(y+4)

c)3(2x+y)-5(y-x)=2(3x-2y)+3(x-y)

-5(x+2)+3(y-1)=4(1-2x)-2(9+2y)

d)2(x+3)-(2y-3)=5(x+2)-4(y-2)

3(3x+y)+4(y-3x)=5(y+x)+2(2y-x)

daje naj !!

Answer 1

a. -2x+6y=38

-24x+15y=0

x=-19+3y

-24(-19+3y)+15y=0

x=-19+3y

57y=456

y=8

x=-19+3x8=5

x=5

y=8

b. 15x=10y

-5x+7y=31

x=⅔y

3 ⅓y=31

x=⅔y

y=9,3

x=6,2

 

c.3x=-5y

3x+7y=1

x=-5/3y

2y=1

x=-5/3y

y=½

x=-5/6

 

d.-3x=-2y+9

-6x=2y

⅔y=x+3

x=-⅓y

y=3

x=-1