Question

5 и 7 номера пожалуйста

Answer 1

5. а)
$8x + 4 = 5x - 20 \ 8x - 5x = - 20 - 4 \ 3x = - 24 \ x = - 24 div 3 \ x = - 8$
б)

$2y = 7y + 10 \ 2y - 7y = 10 \ - 5y = 10 \ y = 10 div ( - 5) \ y = - 2$
в)

$x + 6 - 8 = 2x \ x - 2 = 2x \ x - 2x = 2 \ - x = 2 \ x = - 2$
г)

$- 5y + 13 - 6 = - y - 1 \ - 5y + 7 = - y - 1 \ - 5y + y = - 1 - 7 \ - 4y = - 8 \ y = - 8 div ( - 4) \ y = 2$
7. а)

$2x - 6 = 14 \ 2x = 14 + 6 \ 2x = 20 \ x = 20 div 2 \ x = 10$
б)
$9 - 3x = 0 \ - 3x = - 9 \ x = - 9 div ( - 3) \ x = 3$
в)
$- 15 - x = 7 \ - x = 7 + 15 \ - x = 22 \ x = - 22$
г)

$4x - 2 = 5x - 9 \ 4x - 5x = - 9 + 2 \ - x = - 7 \ = 7$
д)

$x - 9 = - 4x - 7 \ x + 4x = - 7 + 9 \ 5x = 2 \ x = 2 div 5 \ x = 0.4$
е)

$0.6 - 7x= 8 - 6x \ - 7x + 6x = 8 - 0.6 \ - x = 7.4 \ x = - 7.4$