Question

Rozwiąż równanie i sprawdź wynik! POMOCY!

a) -7x + 5 = 11x + 41

b) -s + 15 = 4s - 14

c) 17y + 28 = 19y + 27

d) 8k - 19 = -8k +19

Dam Naj!

Answer 1

a)

-7x + 5 = 11x + 41

-7x -11x = 41 -5

-18x = 36   /:(-18)

x=-2

spr:

-7*(-2)+5 = 11*(-2) +41

14+5 = -22+41

19  =19

b)

-s +15 = 4s -14

-s -4s = -14 -15

-5s = -29    /:(-5)

s = 29/5

s = 5  4/5

spr:

-5  4/5+ 15 = 4*5  4/5 -14

  9 1/5 = 9  1/5

c)

17y + 28 = 19y +27

17y -19y = 27 -28

-2y = -1   /:(-2)

y=1/2

spr:

17*1/2 + 28 = 19*1/2 + 27

36,5 =36,5

d)

8k -19 = -8k +19

8k+8k = 19+19

16k = 38   /:16

k = 19/8

spr:

8*19/8 -19 = -8*19/8 + 19

19-19 = -19+19

0=0