Question

4x+y=7; 5x+y=-12x+3y=5;2x-4y=-9​

Answer 1

4x+0=7

4x=7

x=7/4

x=1,75

Answer 2

It looks like you've provided two systems of linear equations. Let's solve each system step by step:

System 1:

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4x + y = 7
5x + y = -12

Subtract the first equation from the second equation to eliminate y:

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(5x + y) - (4x + y) = -12 - 7
x = -19

Now, substitute the value of x into either of the original equations to solve for y. Let's use the first equation:

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4x + y = 7
4(-19) + y = 7
-76 + y = 7
y = 7 + 76
y = 83

So, the solution to the first system is x = -19 and y = 83.

System 2:

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-12x + 3y = 5
2x - 4y = -9

Let's solve this system using the elimination method. Multiply the second equation by 3 to make the coefficients of y the same in both equations:

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2x - 4y = -9
3 * (2x - 4y) = 3 * (-9)
6x - 12y = -27

Now, add the modified second equation to the first equation to eliminate y:

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-12x + 3y + 6x - 12y = 5 - 27
-6x - 9y = -22

Divide the equation by -3:

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2x + 3y = 22/3

Now, we have a simplified equation with x and y. This equation does not correspond to any of the original equations, so there might have been a mistake in writing down the equations or calculations.

If you can provide the correct equations, I'll be happy to help you solve them.