Question

Помогите плиз решить номер 4 ಥ_ಥ
ಥ_ಥ ಥ_ಥ

Answer 1

$7x + 8 = 57 \\ 7x = 57 - 8 \\ 7x = 49 \\ x = 7$

$8x + x = 720 \\ 9x = 720 \\ x = 80$

$(90 - y) \div 6 = 8 \\ \frac{90 - y}{6} = 8 \\ 90 - y = 8 \times 6 \\ 90 - y = 48 \\ 90 - 48 = y \\ y = 42$

Answer 2

a 7x + 8 = 57

7x= 57-8

7x = 49

x = 7

b 8x+x=720

9х=720

x= 720÷9

x= 80

с (90-у) ÷6 = 8

90-у=48

-у=48-90

-у= -42

у= 42