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3 years ago

Is (4, 7) a solution to the system of equations? Explain your answer.

Mathematics

1 answer:

Angelina_Jolie [31]3 years ago

4 0

Answer:

Step-by-step explanation:

Neither 4 or 7 is a solution to both equations

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The multiplication property of equality could be used to solve which of the following equations?

Evgesh-ka [11]

Multiplication property of equality can be used to solve: $\frac{b}{-2} = 18$

Step-by-step explanation:

First of all, lets define the multiplication property of equality

The multiplication property of equality states that if one side of an equation is multiplied with any number the other side is also multiplied with the number.

Given equations are:

$(x+2)(x-2) = 0\\m+7 = -12\\\frac{b}{-2} = 18\\-3+y = 7$

By observing the equations we can see that only third equation has a fraction in it so it has to be multiplied with -2 for solution

$\frac{b}{-2} * - 2 = 18*-2\\b = -36$

Hence,

Multiplication property of equality can be used to solve: $\frac{b}{-2} = 18$

Keywords: Linear equation, properties

Learn more about linear equations at:

#LearnwithBrainly

7 0

3 years ago

Rewrite in simplest radical form <br> 1<br> x<br> −3<br> 6

vesna_86 [32]

1 / (x-3/6)
1 / x-1/2
x1/2

3 0

3 years ago

Read 2 more answers

A farmer can buy two types of plant food, mix A and mix B. Each cubic yard of mix A contains 35 pounds of phosphoric acid, 15

Nadusha1986 [10]

Answer:

The answer is below

Step-by-step explanation:

Given that the minimum monthly requirements are 840 pounds of phosphoric acid, hence:

35 pounds of phosphoric acid mix A + 14 pounds of phosphoric acid mix B ≥ 840 pounds of phosphoric acid

35x + 14y ≥ 840

The minimum monthly requirements are 540 pounds of nitrogen, hence:

15 pounds of nitrogen mix A + 18 pounds of nitrogen mix B ≥ 540 pounds of nitrogen

15x + 18y ≥ 540

The minimum monthly requirements are 768 pounds of potash, hence:

16 pounds of potash mix A + 64 pounds of potash mix B ≥ 768 pounds of potash

16x + 64y ≥ 768

Also, x ≥ 0 and y ≥0.

Therefore the equations are:

35x + 14y ≥ 840

15x + 18y ≥ 540

16x + 64y ≥ 768

x ≥ 0 and y ≥ 0

Plotting with geogebra gives the graph below.

The point are (0,60), (48,0), (18,15), (32,4)

7 0

2 years ago

suppose a consumer advocacy group would like to conduct a survey to find the proportion p of consumers who bought the newest gen

Zepler [3.9K]

The size of the sample they should take to estimate p with a 2% margin of error and 90% confidence is n = 1691.

In statistics, the margin of error is just the degree of a significant error in the outcomes of random sample surveys.

The formula of margin error is, E = z√((p-vector)(1 - (p-vector)) ÷ n)

E = 2% = 0.02

Confidence level = 90%

Now, the proportion is not given so adopt nominal (p-vector) = 0.05

The critical value at CL of 90% is 1.645.

Thus, making n the subject,

n = z²(((p-vector) × (1 - (p-vector))) ÷ E²)

n = 1.645²((0.5 × 0.5) ÷ 0.02²)

n = 1691.266

n ≈ 1691

Read more about the margin of error at

brainly.com/question/16141482?referrer=searchResults

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4 0

9 months ago

A car dealership uses the linear model y = -1100x + 25000 to

Amiraneli [1.4K]

Answer:

Graph the line using the slope and y-intercept, or two points.

Slope:

−

1000

-1000

y-intercept:

(

25000

)

(0,25000)

25000

xy025000250

Step-by-step explanation:

(づ￣ ³￣)づ

8 0

3 years ago