Question

Решить систему 7x+5y=2 x+5y=9

Answer 1

Умножаем второе уравнение на -1
7х+5у=2
-х-5у=-9
-5у и +5у исключаем и складываем уравнения
6х=-7|/6
Х=-7/6
Подставляем х в любое уравнение
7*(-7/6)+5у=2
У= 61/30

Answer 2

I can help you with math problems. To solve this system of equations, you can use the substitution method. First, subtract 5y from both sides of the first equation to get 7x = 2 - 5y. Then, divide both sides by 7 to get x = (2 - 5y) / 7. Next, substitute this expression for x into the second equation to get (2 - 5y) / 7 + 5y = 9. Multiply both sides by 7 to get 2 - 5y + 35y = 63. Simplify and solve for y to get y = 61 / 30. Finally, plug this value of y into the first equation to get x = (2 - 5 * 61 / 30) / 7. Simplify and solve for x to get x = -31 / 42. Therefore, the solution is x = -31 / 42 and y = 61 / 30. You can check your answer by plugging these values into the original equations and verifying that they are true. For more help with solving systems of equations, you can visit [this website](https://quickmath.com/solve/) or [this one](https://www.mathway.com/algebra). You can also use [this calculator](https://www.symbolab.com/solver/system-of-equations-calculator) to solve systems of equations online. I hope this was helpful.