Question

1)7х-у=12; 2)4х+3у=11

Answer 1

Ответ:

1)7x-12×2

2)4x+11×3

Пошаговое объяснение:

вот ответ

Answer 2

To solve the system of equations:

1. 7x - y = 12
2. 4x + 3y = 11

There are several methods to solve this system, but I'll demonstrate the method of substitution. Here's how it works:

Step 1: Solve one of the equations for one variable in terms of the other variable. Step 2: Substitute the expression from Step 1 into the other equation. Step 3: Solve the resulting equation to find the value of one variable. Step 4: Once you find the value of one variable, substitute it back into either of the original equations to find the value of the other variable.

Let's solve the system step by step:

Step 1: Solve the first equation for y in terms of x: 7x - y = 12 y = 7x - 12

Step 2: Substitute the expression for y from Step 1 into the second equation: 4x + 3(7x - 12) = 11

Step 3: Now, solve the equation for x: 4x + 21x - 36 = 11 25x - 36 = 11 25x = 47 x = 47 / 25 x = 1.88

Step 4: Substitute the value of x back into the expression we found for y in Step 1: y = 7x - 12 y = 7(1.88) - 12 y = 13.16 - 12 y = 1.16

So the solution to the system of equations is x = 1.88 and y = 1.16.