Mathematics: Elimination method 4x-2y=48 2x+6y=-18

Elimination method 4x-2y=48 2x+6y=-18 - id424826181850895, eve2055

Ответ:

jayjay3787

31.12.2021

$4x-2y=48\\ \\ 2x+6y=-18$

First we'll multiply the second equation by -2

$-2\cdot (2x+6y)=-2\cdot -18\\ \\ -4x-12y=36$

Now let's add the new equation and the first one.

$(4x-2y)+(-4x-12y)=48+36\\ \\ 4x-4x-2y-12y=48+36\\ \\ -14y=84\\ \\ y=\frac { 84 }{ -14 } \\ \\ y=-6$

We found y's value. We'll plug it in one of the equations to find x's value.

$y=-6\\ \\ 4x-2y=48\\ \\ 4x-2\cdot -6=48\\ \\ 4x+12=48\\ \\ 4x=48-12\\ \\ 4x=36\\ \\ x=\frac { 36 }{ 4 } \\ \\ x=9$

Solution ;

(9, -6)

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Ответ:

Jaydenbaysinger122

04.01.2021

Mathematics

"The product of a number and 8"=8n

8n is the expression, evaluated when n=4 is:

8(4)=32

Step-by-step explanation:

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Elimination method
4x-2y=48
2x+6y=-18

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