Question

1)x+21=16. 2)-81-x=-1

Answer 1

2) 81-х=1

х=81-1

×=80

81-80=1

Answer 2

Ответ:

$1)x = - 5$

$2)x = 80$

Пошаговое объяснение:

$1)x + 21 = 16$

$x = 16 - 21$

$x = - 5$

Проверка:

________________________

$- 5 + 21 = 16$

$16 = 16$

$2) - 81 - x = - 1$

$- x = - 1 + 81$

$- x = 80$

$x = 80$

Проверка:

__________________________

$- 81 - 80 = - 1$

$- 1 = - 1$

Answer 3

To solve the equations, let's work on them one by one:

1. x + 21 = 16

To isolate x, we need to get rid of the constant term 21 on the left side. We can do this by subtracting 21 from both sides of the equation:

x + 21 - 21 = 16 - 21

Simplifying:

x = -5

Therefore, the solution to the first equation is x = -5.

2. -81 - x = -1

To isolate x, we can start by adding 81 to both sides of the equation to eliminate the constant term -81:

-81 + 81 - x = -1 + 81

Simplifying:

-x = 80

To solve for x, we need to multiply both sides of the equation by -1 to get rid of the coefficient -1 in front of x:

(-1)(-x) = (-1)(80)

Simplifying:

x = -80

Therefore, the solution to the second equation is x = -80.