Question

X-5a=-49, если -4x-9=7​

Answer 1

Ответ:

Пошаговое объяснение:

x - 5a = -49, если -4x - 9 = 7

Найдем x:

​-4x - 9 = 7

-4x = 7 + 9

-4x = 16

x = 16 : (-4)

x = -4

Подставим вычисленное значение в уравнение:

x - 5a = -49

-4 - 5a = -49

-5a = -49 + 4

-5a = -45

a = -45 : (-5)

a = 9

Ответ: a = 9.

Answer 2

To solve the system of equations -4x - 9 = 7 and x - 5a = -49, we can use the method of substitution. Let's solve the first equation for x:

-4x - 9 = 7

Add 9 to both sides:

-4x = 16

Divide both sides by -4:

x = -4

Now we can substitute this value of x into the second equation:

x - 5a = -49

Substituting x = -4:

-4 - 5a = -49

Add 4 to both sides:

-5a = -45

Divide both sides by -5:

a = 9

Therefore, the solution to the system of equations is x = -4 and a = 9.