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bearhunter [10]
3 years ago
15

A line with a slope of -2 passes through the point (4, 7).

Mathematics
2 answers:
Crazy boy [7]3 years ago
5 0

Answer:

y-7= -2 (x-4)

Step-by-step explanation:

We can use the point slope formula, since we have a point, and a slope

y-y_{1} =m(x-x_{1})

m is the slope, y1 is the y coordinate of the point, and x1 is the x coordinate of the point

We know -2 is the slope, 7 is the y coordinate, and 4 is the x coordinate, so we can substitute them in

y-7= -2 (x-4)

Since we don't need to solve, this is the answer. The first bracket is -2, and the second is 4

Ksivusya [100]3 years ago
5 0

Point-slope form:  y - y₁ = m(x - x₁)

(m is the slope, (x₁, y₁) is the point you are given that's on the line)

You know:

m = -2

(x₁, y₁) = (4, 7)         So plug it into the equation

y - y₁ = m(x - x₁)  

y - 7 = -2(x - 4)

[so the first bracket is -2, the second bracket is 4]

You might be interested in
A bottle contains 30 fluid ounces of orange juice and 18 fluid ounces of pineapple juice. Which graph has a slope that best repr
mojhsa [17]

Answer:

option B. G

Step-by-step explanation:

Let

y ---->ounces of orange juice

x --->  ounces of pineapple juice

we know that

The ratio of orange juice to pineapple juice is equal to

ratio=\frac{y}{x}

substitute the given values

ratio=\frac{30}{18}

simplify

ratio=\frac{5}{3}=1.67

<u><em>Verify each graph</em></u>

Remember that the formula of slope is "rise over run", where the "rise" (means change in y, up or down) and the "run" (means change in x, left or right)

we have

ratio=\frac{5}{3}

that means

5 ounces of orange juice per 3 ounces of pineapple juice

Graph F

The slope is

m=\frac{4}{6}=\frac{2}{3}=0.67

Graph G

The slope is

m=\frac{4}{2}=\frac{2}{1}=2

Graph H

The slope is

m=\frac{70}{6}=\frac{35}{3}=11.67

Graph J

The slope is

m=\frac{12}{10}=\frac{6}{5}=1.2

The value of 2 is the value closest to 1.67

therefore

The graph that has a slope that best represents the ratio of orange juice to pineapple juice is Graph G

7 0
3 years ago
A car dealership has found that the length of time before a major repair is required on the new cars it sells is normally distri
weqwewe [10]

Answer:

Step-by-step explanation:

Hello!

The variable of interest in this case is:

X: length of time before a major repair is required on a new car. (months)

This variable has a normal distribution with mean μ= 36 months and a standard deviation σ= 9 months.

If he wants to set a guarantee period in which only 5% of the sold cars fell, the objective is to find the value of X that has below 5% of the cars that need major repairs before the end of the guarantee period.

Check the attachment, the curve represents the distribution of the population of the time it takes before a new car needs major repairs, I've marked approximately where this value of X should be.

Symbolically:

P(X≤a)=0.05

To reach the proper value of "a" you have to work using the standard normal distribution because is a tabulated distribution and you can extrapolate it to any normal distribution.

Z= \frac{X-Mu}{Sigma}~N(0;1)

So the first step is to look in the table of the Z distribution for the value that accumulates 0.05 of probability since it is such a low probability, you have to look for the value in the left side of the table (negative values of Z). You look for 0.05 in the body of the table and then the margins for the corresponding value (see second attachment)

Z_{0.05}= -1.64

Then the value that accumulates 0.05 of probability is -1.64, now you have to reverse the standardization to reach the asked value of X

Z= (a- μ)/σ

(Z*σ)= a - μ

a=(Z*σ)+ μ

a=(-1.64*9)+36

a= 21.24 months.

The guarantee period should be 21.24 months so that only 5% of the sold cars will need major repairs before it wears of.

I hope it helps!

5 0
3 years ago
What is 10% of the number 50?
madam [21]

5.

To find this, you can do the is over of technique.

The is over of technique is as says - is over of and percent over one hundred.

If you use this technique, your equation should look like this:

x/50 = 10/100

Cross multiply 10 and 50 and divide by 100 to get the answer of 5.

Hope this helps!

7 0
3 years ago
Read 2 more answers
Find the accumulated value of an investment of $1710 at 5% compounded annually for 20 years.
LenKa [72]

Answer:

D

1710(1+0.05)²⁰=4537.14

4 0
3 years ago
Dan had 7 dimes in his bank his dad gave him 9 more dimes how many dimes does Dan have now
timofeeve [1]

Answer:

16 dimes

Step-by-step explanation:

He already has 7, and got 9 more, so we can add 7 and 9

7+9 =16

So, Dan has 16 dimes now

Hope this helps! :)

3 0
3 years ago
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