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Tema [17]
3 years ago
8

Solve the system of equations. – 5x + 2y = 9 y = 7x X = Y =

Mathematics
2 answers:
Helen [10]3 years ago
6 0

Answer:

x = 1

y = 7

Step-by-step explanation:

Your system of equations is

-5x + 2y = 9

y = 7x

The easiest way to solve this is by substitution.  This means that you set one of the equations equal to a variable and you plug that variable into the variable of the other equation.  The second equation (y = 7x) is already set up this way so we will plug it into the first equation.

-5x + 2(7x) = 9

-5x + 14x = 9

9x = 9

(9x)/9 = (9)/9

x = 1

You have found x.  Now, plug this number into the second equation (y = 7x) to find the value of y.

y = 7(1)

y = 7

Sphinxa [80]3 years ago
5 0

Answer:

<em> x−y = 9 , x + y = 6</em>

<em>x + y = 4  ,  x − y = 2</em>

<em>x + 2 y = 4  ,  x − y = − 3 </em>

<em>try out these examples?</em>

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It looks like all you want is question 6. If that is the case, there are two ways to do it.

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<u>First answer</u>

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b - 22 = 5              Add 22 to both sides.

b = 5 + 22

b = 27

<u>Second Answer</u>

Equate to - 5

b - 22 = -5

b = 22 - 5

b = 17

Method Two

<u>Graph the question</u>

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Step-by-step explanation:

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The size of the interior angle of a regular decagon...Need an answer ASAP
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I'm thinking of a number. If you multiply it by 5 and then subtract 24, you will get -44. What is my number?
Allushta [10]

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You would like to make a nutritious meal of eggs, edamame, and elbow macaroni. The meal should provide at least 40 g of carbohyd
Virty [35]

Answer:

Lets denote

1. eggs as x,

2. edamame as y

3. elbow macaroni as z

The problem then is

min TC=2x+5y+3z

subject to

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Step-by-step explanation:

First the objective is to minimize total cost subject to some nutritional requirements.

So the total cost function (TC) is the number of servings multiplied for the corresponding costs. Eggs cost 2, edamame 5, and macaroni 3

Next we have to meet the nutritional requirements, the first of the restrictions is the protein restriction. The problem requires that the meal contains at least 40g of carbohydrates (that is why the restriction is \geq 40). Then we add how much each meal component adds to the total, eggs add 2g of carbs, edamame 12g, and macaroni 43g.

Same for protein, we need at least 20 grams of protein (\geq 20). Eggs add 17g, edamame adds 12g, and macaroni adds 8g.

Finally we don't want more than 50 grams of fat (\leq50). Eggs add 14g, edamame add 6g and macaroni 1g.

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