Question

A=7 Реши систему уравнений { 2a−b=20 Ответ: a= b=

Answer 1

Ответ:

a = 7

b = -6

Объяснение:

a = 7

2a - b = 20

14 - b = 20

b = 14 - 20

b = -6

Answer 2

Ответ:

а=7

в=-6

Объяснение:

Подставляем а=7

2*7-в=20

14-в=20

в=14-20

в=-6

Можно лучшее решение?))

Answer 3

To solve the system of equations, we need to find the values of 'a' and 'b' that satisfy both equations simultaneously. Given the system:

1. 2a - b = 20

To find the values of 'a' and 'b,' we can use substitution or elimination methods. Let's use the substitution method:

Step 1: Solve one equation for one variable in terms of the other variable. 2a - b = 20 => 2a = b + 20 => a = (b + 20) / 2

Step 2: Substitute the expression for 'a' from Step 1 into the other equation. Replace 'a' in the second equation with (b + 20) / 2:

2. a = (b + 20) / 2

Now, we have a system of equations with one variable, 'b':

2. (b + 20) / 2 = 7

Step 3: Solve for 'b':

Multiply both sides by 2 to eliminate the fraction:

b + 20 = 2 * 7 b + 20 = 14

Subtract 20 from both sides:

b = 14 - 20 b = -6

Step 4: Find the value of 'a' using the value of 'b':

a = (b + 20) / 2 a = (-6 + 20) / 2 a = 14 / 2 a = 7

So, the solution to the system of equations is: a = 7 b = -6