Question

4x + 3y = -7,2 x - y = 9;​

Answer 1

{-это есть или нет?
Если есть
Ответ: y=-9+2x
4x+3*(-9+2x)=-7
4x-27+6x=-7
10x=20
x=2
y=-9+2*2
y=-5

Answer 2

It looks like you have a system of two linear equations with two variables, x and y:

1. $4x + 3y = -7$
2. $2x - y = 9$

There are several methods to solve this system of equations. One common method is the substitution method. Here's how you can solve it using substitution:

Step 1: Solve one of the equations for one variable. Let's solve equation (2) for y: $y = 2x - 9$

Step 2: Substitute the value of y from step 1 into equation (1): $4x + 3(2x - 9) = -7$

Step 3: Solve for x: $4x + 6x - 27 = -7$ $10x - 27 = -7$ $10x = 20$ $x = 2$

Step 4: Substitute the value of x into the equation for y from step 1: $y = 2(2) - 9$ $y = 4 - 9$ $y = -5$

So, the solution to the system of equations is $x = 2$ and $y = -5$.

You can also verify the solution by substituting these values back into the original equations to ensure they satisfy both equations.