Question

(2x - y = 3(7x + 3y = 4​

Answer 1

Ответ:

х=1 у= -1

Объяснение:

$(2x - y = 3 \\ (7x + 3y = 4 \\ y = 2x - 3 \\ 7x + 3 \times (2x - 3) = 4 \\ 7x + 6x - 9 = 4 \\ 13x = 13 \\ x = 1 \\ y = 2 \times 1 - 3 \\ y = - 1$

Отметьте ответ лучшим)))

Answer 2

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Answer 3

It looks like you've provided a system of two linear equations with two variables. To solve for the values of x and y, you can use either the substitution method or the elimination method. Let's use the elimination method in this case.

The given system of equations is:

1. 2x - y = 3
2. 7x + 3y = 4

First, let's make the coefficients of one of the variables equal so that we can eliminate it. Let's eliminate y. To do that, we can multiply the first equation by 3 (the coefficient of y in the second equation) and then add the two equations together to eliminate y:

(3 * (2x - y) = 3 * 3) (6x - 3y = 9)

Now, add the two equations:

(6x - 3y) + (7x + 3y) = 9 + 4

Combine like terms:

13x = 13

Now, divide both sides by 13 to solve for x:

x = 13 / 13 x = 1

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

2x - y = 3 2(1) - y = 3 2 - y = 3

Now, subtract 2 from both sides to solve for y:

-y = 3 - 2 -y = 1

Multiply both sides by -1 to isolate y:

y = -1

So, the solution to the system of equations is: x = 1 y = -1