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igomit [66]
3 years ago
9

Which statement correctly explains how Dana can solve the following system of linear equations for x using the elimination metho

d?
4x+8y=20
-4x+2y= -30
Add the two equations, solve for y, and then substitute –1 for y to find x.
Multiply the bottom equation by –4, solve for y, and then substitute –1 for y to find x.
Multiply the bottom equation by –1, combine the two equations, solve for y, and then substitute 1 for y to find x.
Multiply the two equations, solve for y, and then substitute 1 for y to find x.
Mathematics
2 answers:
Vanyuwa [196]3 years ago
6 0
1. The correct statement is the first one, which is: <span>Add the two equations, solve for y, and then substitute –1 for y to find x.
</span>
 2. Therefore, you have the following system of equations:
<span>
 4x+8y=20
 -4x+2y= -30

 3. When you a</span>dd the two equations, and clear the variable "y", you obtain:

 10y=-10
 y=-1

 4. Now, you must substitute -1 for y (y=-1) to find x, as below:

 4x+8y=20
 4x+8(-1)=20
 4x-8=20
 4x=20+8
 4x=28
 x=28/4
 x=7
patriot [66]3 years ago
4 0

Answer:

A

Step-by-step explanation:

3dg 2020 answer

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The polynomial (a + b)(a² – ab + b²) is reconstructed as (2x + y)(4y² – 2xy + y²), then the correct option is C.

<h3>What is polynomial?</h3>

Polynomial is an algebraic expression that consists of variables and coefficients. Variables are called unknown. We can apply arithmetic operations such as addition, subtraction, etc. But not divisible by variable.

Tomas learned that the product of the polynomials (a + b)(a² – ab + b²) was a special pattern that would result in a sum of cubes, a³ + b³.

His teacher put four products on the board and asked the class to identify which product would result in a sum of cubes if a = 2x and b = y.

Then the polynomial equation will be

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More about the polynomial link is given below.

brainly.com/question/17822016

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Which equations have the same value as 3/5 (30x-15)=72 select 3
const2013 [10]

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x=4.5

Step-by-step explanation:

Given the equation  \frac{3}{5}(30x-15)=72, we simplify as:

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Answer:

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Step-by-step explanation:

To some this, let's first list all the factors of 152. They are;

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Now, let's arrange them to reflect being multiplied to get 152.

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Also, let's do the same for their sum;

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Looking at the figures above, the ones that their product is 152 but have the least sum are 8 and 19

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