Question

Если x + y = 5, а x - y = 0, то чему равна каждая переменная?

Answer 1

Ответ:

x = 2.5, y = 2.5

Пошаговое объяснение:

$\left \{ {{x+y = 5} \atop {x-y=0}} \right. \\\\x = 5 - y\\\\5-y-y=0\\-2y=-5\\y=2.5\\x=5-2.5=2.5$

Answer 2

Ответ:

х=2,5

у=2,5

Пошаговое объяснение:

Сложив оба уравнения , получим 2х=5

х=2,5. Подставив в любое, у=2,5

Answer 3

To solve this system of equations, we can use either the substitution method or the elimination method. Let's use the elimination method in this case:

Given:

1. x + y = 5
2. x - y = 0

To eliminate one variable, we can add the two equations together:

(x + y) + (x - y) = 5 + 0

This simplifies to:

2x = 5

Now, to solve for x, we divide both sides by 2:

x = 5 / 2 x = 2.5

Now that we know the value of x, we can find the value of y by substituting x back into one of the original equations. Let's use the first equation:

x + y = 5

Substitute x with 2.5:

2.5 + y = 5

Now, solve for y:

y = 5 - 2.5 y = 2.5

So, the values of the variables are: x = 2.5 y = 2.5