Question

Va roooog ajutati ma 18 si 19

Sunt mici si la fel

Dau coroanaaa​

Answer 1

Răspuns:

18.

3x - 7 = 10

3x = 10 + 7

3x = 17

x = 17/3 ∉ Z

- 5x + 4 = 27

4 - 27 = 5x

- 23 = 5x

x = - 23/5 ∈ Z

x + 3 = - 7x + 4

x + 7x = 4 - 3

8x = 1

x = 1/8 ∉ Z

19.

- 2x + 4 = 6

9x - 21 = 6

16x - 8 = 48 - 12x

Answer 2

$18)a)3x = 17 \\ x = \frac{17}{3} apartine \: lui \: q$

$b) - 5x = 23 \\ x = - \frac{23}{5}$

$c)x + 7x = 4 - 3 \\ 8x = 1 \\ x = \frac{1}{8}$

$19)a) - x = 1 \\ x = - 1 \\ ec \: echivalenta \\ x - 4 = - 5 \\ x - 3 = - 4$

$3x = 9 \\ x = 3 \\ ec \: echivalenta \\ x + 2 = 5 \\ x + 3 = 6$

$c)4x + 3x = 12 + 2 \\ 7x = 14 \\ x = 2 \\ ec \: echivalenta \\ x + 2 = 4 \\ x + 4 = 6$