Question

{4x+4y=84 {2x=3y помогите 1 Смотреть ответ гюйс гюйс 4х+4у=84 2х=3у х+у=21 2х=3у х=21-у 2(21-у)=3у х=21-у 3у+2у=42 х=21-у 5у=42 х=21-у у=8,4 х=12,6 у=8,4 (12,6; 8,4)

Answer 1

To solve this system of equations, you can use either substitution or elimination method.

Here's how to use substitution:

From the second equation, you can isolate x in terms of y by dividing both sides by 2: 2x = 3y x = (3/2)y

Now substitute this expression for x in the first equation: 4x + 4y = 84 4((3/2)y) + 4y = 84

Simplify and solve for y: 6y + 4y = 84 10y = 84 y = 8.4

Now substitute this value for y to find x: x = (3/2)y = (3/2)(8.4) = 12.6

Therefore, the solution to the system of equations is (12.6, 8.4).