Question

Rozwiąż równanie -2 (x+3)+4 (2x+3)=- 6

Answer 1

- 2(x + 3) + 4(2x + 3) = - 6
- 2x - 6 + 8x + 12 = - 6
6x = - 6 + 6 - 12
6x = - 12
x = - 12/6 = - 2
a)
3x - 4y = 14 / * 3
- 2x + 3y = - 4 / * 4

9x - 12y = 42
- 8x + 12y = - 16
dodajemy stronami
9x - 8x - 12y + 12y = 42 - 16
x = 26
3x - 4y = 14
3 * 26 - 4y = 14
78 - 4y = 14
- 4y = 14 - 78 = - 64
y = 64/4 = 16
x = 26
y = 16

Answer 2

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

-2x - 6 + 8x + 12= - 6

-2x + 8x - 6 + 12= - 6

6x + 6 = - 6

6x = - 6 - 6

6x= - 12

x= - 12 : 6

x= - 2


spr.

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

L= -2(x + 3) + 4(2x + 3) = -2(-2 + 3) + 4(2*(-2) + 3)= -2*1 + 4(-4+ 3)= - 2 + 4*(-1) =-2 + (-4) = - 2 - 4= - 6

P= - 6

- 6 = -6

L=P