Question

Решите систему уравнений5х+6у=-209у+2х=25ПОМОГИТЕ РЕШИТЬ, МНЕ СКАЗАЛИ ДО ЗАВТРА СДЕЛАТЬ, А ТО ПОСТАВЯТ 3 ЗА ТРИМЕСТР !!! Очень прошу помогите

Answer 1

5х=-20-6у/:5                               у=5
х=-4-6/5у                                   5х+6у=-20
9у+2(-4-6/5у)=25                        5х+6*5=-20
9у-8-12/5у=25                            5х=-20-30
9у-2.2/5у=25+8                           5х=-50
6.3/5у=33                                   х=-10
у=5

Answer 2

Solving the System of Equations

To solve the system of equations:

5x + 6y = -209 (Equation 1) 2x + y = 25 (Equation 2)

We can use the method of substitution or elimination. Let's use the substitution method.

From Equation 2, we can express y in terms of x:

y = 25 - 2x

Now, substitute this value of y into Equation 1:

5x + 6(25 - 2x) = -209

Simplify the equation:

5x + 150 - 12x = -209

Combine like terms:

-7x + 150 = -209

Move 150 to the other side of the equation:

-7x = -209 - 150

Simplify:

-7x = -359

Divide both sides of the equation by -7 to solve for x:

x = -359 / -7

Simplify:

x = 51.29 (rounded to two decimal places)

Now, substitute this value of x back into Equation 2 to find y:

2(51.29) + y = 25

Simplify:

102.58 + y = 25

Move 102.58 to the other side of the equation:

y = 25 - 102.58

Simplify:

y = -77.58 (rounded to two decimal places)

Therefore, the solution to the system of equations is:

x = 51.29 y = -77.58

Please note that these calculations are based on the information provided. Double-check your work to ensure accuracy.