Question

X - 2y =5,3x + 8y = 1;​

Answer 1

Сделаем методом подставки:

х=5+2у

3х+8у=1

Ставим значение переменной х во второе уравнение. Получаем:

3*(5+2у)+8у=1

15+6у+8у=1

14у=-14

у=-1

Ставим у в первое уравнение:

х=5+2*(-1)

х=5-2

х=-3

Ответ: х= - 3, у= - 1.

Answer 2

Ответ:

Объяснение:

18

100%

Answer 3

To solve the system of linear equations:

1. X - 2y = 5
2. 3x + 8y = 1

You can use the method of substitution or elimination. I'll use the elimination method here.

First, we need to manipulate one of the equations so that when we add or subtract the equations, one of the variables is eliminated. Let's eliminate y:

Multiply the first equation by 4 so that the coefficients of y in both equations are opposites:

1. 4(X - 2y) = 4(5) -> 4x - 8y = 20
2. 3x + 8y = 1

Now, add the two equations together to eliminate y:

(4x - 8y) + (3x + 8y) = 20 + 1

Combine like terms:

4x + 3x = 21

7x = 21

Now, divide both sides by 7 to solve for x:

7x/7 = 21/7

x = 3

Now that you have found the value of x, you can substitute it back into one of the original equations to solve for y. Let's use the first equation:

1. X - 2y = 5
2. 3 - 2y = 5

Subtract 3 from both sides:

-2y = 5 - 3

-2y = 2

Now, divide by -2 to solve for y:

-2y / -2 = 2 / -2

y = -1

So, the solution to the system of equations is:

x = 3 y = -1