3 years ago

Which method would you use to solve this System of Equations? x = -2 2x + y = 5

1 answer:

3 0

x= -4x + y = 5

-4x / 5 = -0.8

So its A. - Substitution

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Crank

So for this, I will be using the substitution method. Firstly, subtract both sides in the second equation by 2x: $4x+3y=20\\ y=7-2x$

Next, substitute y in the first equation with 7-2x, then solve for x from there:

$4x+3(7-2x)=20\\ 4x+21-6x=20\\ -2x+21=20\\ -2x=-1\\ x=\frac{1}{2}$

Now that we got x, substitute it into either equation to solve for y:

$4*\frac{1}{2}+3y=20\\ 2+3y=20\\ 3y=18\\ y=6\\ \\ 2*\frac{1}{2}+y=7\\ 1+y=7\\ y=6$

In short, x = 1/2 and y = 6.

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andrey2020 [161]

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Step-by-step explanation:

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Julli [10]

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ioda

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