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oksian1 [2.3K]
3 years ago
12

A line contains the points (2,4) and (−6,−2).

Mathematics
1 answer:
zmey [24]3 years ago
4 0

Answer:

D) y-4=3/4(x-2)

Step-by-step explanation:

m=(y2-y1)/(x2-x1)

m=(-2-4)/(-6-2)

m=-6/-8

simplify

m=3/4

y-y1=m(x-x1)

y-4=3/4(x-2)

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43x+ 67y = -24 and 67x + 43y = 24 solve
aleksandrvk [35]

Answer:

  (x, y) = (1, -1)

Step-by-step explanation:

We'll write these equations in general form, then solve using the cross-multiplication method.

  43x +67y +24 = 0

  67x +43y -24 = 0

∆1 = (43)(43) -(67)(67) = -2640

∆2 = (67)(-24) -(43)(24) = -2640

∆3 = (24)(67) -(-24)(43) = 2640

These go into the relations ...

  1/∆1 = x/∆2 = y/∆3

  x = ∆2/∆1 = -2640/-2640 = 1

  y = ∆3/∆1 = 2640/-2640 = -1

The solution is (x, y) = (1, -1).

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<em>Additional comment</em>

The cross multiplication method isn't taught everywhere. The attachment explains a bit about it. Our final relationship changes the order of the fractions to 1, x, y from x, y, 1. That way, we can use the equation coefficients in their original general-form order. (The fourth column in the 2×4 array of coefficients is a repeat of the first column.)

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3 years ago
I WILL GIVE BRAINLIST AND 50 POINTS
Alisiya [41]

Step-by-step explanation:

A proportional relationship graph would show that the points can be arranged in a line that passes through the origin.

All of the points in Graphs B, C and D cannot be connected in 1 straight line, hence they are not proportional relationships.

Only Graph A shows a proportional relationship.

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A skydiver weighing 180lbs (including equipment) falls vertically downward from an altitude of 5000 ft and opens the parachute a
Annette [7]

<span>For the presented problem, the solution would be</span><span> </span><span>v</span><span>(0)=0</span><span>v(0)=0</span><span> is</span><span>v</span><span>(</span><span>t</span><span>)−</span><span>mgb</span><span>=</span><span>e</span><span>−</span><span>b</span><span>/</span><span>m</span><span>⋅</span><span>t</span><span>(</span><span>v</span><span>0</span><span>−</span><span>mgb</span><span>)</span><span>⟺</span><span>v</span><span>(</span><span>t</span><span>)=</span><span>mgb</span><span>(</span><span>1−</span><span>e</span><span>−</span><span>b</span><span>/</span><span>m</span><span>⋅</span><span>t</span><span>)</span><span>≈</span><span>g</span><span>⋅</span><span>t</span><span>−</span><span>gb</span><span>2</span><span>m</span><span>⋅</span><span>t</span><span>2</span><span>, with the following given, </span><span>
m</span><span>=180[lb]=81.6[kg]</span><span> </span>

<span>g</span><span>=9.81[m/s</span><span>2</span><span>]</span><span />

<span>b</span><span>=0.75[kg</span><span>⋅</span><span>m/s</span><span>2</span><span>⋅</span><span>s/ft]=0.2286[kg/s]</span><span />

<span>The solution that the friction provides is </span><span>v</span><span>(</span><span>t</span><span>)=3501.7[m/s]</span><span>⋅</span><span>(</span><span>1−</span><span>e</span><span>−0.00280[1/s]</span><span>⋅</span><span>t</span><span>), where I get </span><span><span>96.69</span></span><span /><span><span><span><span>[</span></span><span /><span><span>m</span></span><span /><span><span><span><span>/</span></span></span></span></span><span><span><span>s</span></span><span /><span><span>]</span></span></span><span>=</span></span><span /><span><span>317.2</span></span><span /><span><span><span><span>[</span></span><span /><span><span>f</span><span>t</span></span><span /><span><span><span><span>/</span></span></span></span></span><span><span><span>s</span></span><span /><span><span>]</span></span></span></span><span><span /></span><span>. I am hoping that this answer has satisfied your query about this specific question.<span /></span>

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(NEED HELP ASAP) What rule defines the function in each of the following graphs?
QveST [7]

Hey there!!

The graph B is not a function as it doesn't pass the vertical line test, as there are two x values repeating.

We do not want value x repeating, if it does, it is not considered to be a function anymore.

Hope my answer helps!

3 0
3 years ago
For two populations of rabbits, R and S, the proportions of rabbits with white markings on their fur are given as pR and pS, res
BlackZzzverrR [31]

Answer:

The standard deviation is  \hat p_{R} -\hat p_{S} = \sqrt{\frac{\hat p_{R}(1-\hat p_{R})}{50} + \frac{\hat p_{S}(1-\hat p_{S})}{100} }

Step-by-step explanation:

The standard deviation of a sampling distribution is the standard error or a valuation of the standard deviation. Where statistic parameter is the mean it is referred to as the standard error of the mean.

The formula for standard deviation of a sampling distribution is as follows;

\hat p_{R} -\hat p_{S} = \sqrt{\frac{\hat p_{R}(1-\hat p_{R})}{n_R} + \frac{\hat p_{S}(1-\hat p_{S})}{n_S} }

Where;

{\hat p_{R}} = Sample proportion of rabbits with white markings from R

{\hat p_{S}} = Sample proportion of rabbits with white markings from S

n_R = Number of from R = 50

n_S = Number of from S = 100

Therefore, the standard deviation of the sampling distribution is given as follows;

\hat p_{R} -\hat p_{S} = \sqrt{\frac{\hat p_{R}(1-\hat p_{R})}{50} + \frac{\hat p_{S}(1-\hat p_{S})}{100} }.

3 0
3 years ago
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