Mathematics, 16.09.2019 19:50 kelseatuttleni

15 points
can someone check my answers?
1. for the data in the table, does y vary directly with x? if it does write an equation for the direct variation.(x, y) (8,11) (16,22) (24,33)
yes y=2.75x
yes y=0.6875x*
yes y=1.375x
no y does not vary directly with x
(for #1, i'm debating between b and d)
2.for the data in the table, does y vary directly with x? if it does write an equation for the direct variation. (x, y) (16,4) (32,16) (48,36)
yes y=2x
yes y=4x
yes y=8x
no y does not very directly with x*
3. (time/hour, distance/miles)(4,233) (6,348) (8,464) (10, 580)
express the relationship between distance and time in a simplified form as a unit rate. determine which statement correctly interprets this relationship.
232 your care travels 232 miles
1/58 your car travels 58 miles in 1 hour*
58/1 your car travels 58 miles in 1 hour
10 your car travels for 10 hours
4.what is the slope of the line that passes through the pair of points (2,5) and (8,3)
1/3*
-1/3
3
-3
4.what is the slope of the line that passes through the pair of points (-5.2,8.7) and (-3.2,2.7)
2
3*
-2
-3
5. what is the slope of the line that passes through the pair of points (3/2,-2) and (-3,7/3)
-27/26
-26/27
26/27*
27/26
6.write an equation in point slope from for the line through the given point with the given slope (5,2) m=3
y+2=3(x-5)*
y+2=3x-5
y-2=3(x+5)
y-2=3(x-5)
7. write an equation in point slope form for the line through the given point with the given slope (-3,-5) m=-2/5
y+5=-2/5(x+3)
y+5=(-2/5) x-3*
y-5=-2/5(x+3)
y-5=-2/5(x-3)
8. write an equation in point slope from for the line through the given point with the given slope. (4,-7) m=-0.54
y+7=-0.54(x-4)
y-7=-0.54x-4
y+7=-0.54(x+4)
y-7=-0.54(x-4)*
9. the table shows the height of a plant as it grows. which equation in point slope from gives the plants height (time, plant height) (2,16)(4,32)(6,48)(8,64)
y-16=8(x-2)*
y-16=8x-2
y+16=8(x+2)
the relationship is nonlinear
10. write y=-2/3x+7 in standard form
2x+3y=21
3x-2y=22
-2x-3y=21*
-2x+3y=7
11. write y=-1/2x+1in standard form using integers
x+2y=2
x+2y=-2***
2x+y=-2
x-2y=2

Answers: 2

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Answer from: chrisssrutter

1. y varies directly with x and the equation is y=1.375x

2. No, y does not vary directly with x

3. Your car travels 58 miles in 1 hour

4. $-\frac{1}{3}$

5. $-\frac{26}{27}$

6. y-2=3(x-5)

7. $y+5=-\frac{2}{5}(x+3)$

8. y+7=-0.54(x-4)

9. y-16=8(x-2)

10. 2x+3y=21

11. x+2y=2

Step-by-step explanation:

For to vary directly with , all the 3 pair of numbers need to show the same ratio if we divide each y's by the x's. Let's check.

$\frac{11}{8}=1.375$ $\frac{22}{16}=1.375$ $\frac{33}{24}=1.375$

So all of them show the same ratio and hence y varies directly with x.

For equation, we already saw that multiplying x by 1.375 gives us y. We can write in equation form as:

y=1.375x

Third answer choice is correct.

This is similar to #1. So let's check the ratios.

$\frac{4}{16}=0.25$ $\frac{16}{32}=0.5$ $\frac{36}{48}=0.75$

As we can see, the ratios are not equal to y does not vary directly with x.

Fourth answer choice is correct.

The first number in the pair gives time and second number gives distance. To get unit rate, we divide the distance by time. So we will get the number of miles traveled in 1 hour.

$\frac{233}{4}=58.25$ [ i believe this is a typo and it should be 232 miles and ratio would be 58 ]

$\frac{348}{6}=58$

$\frac{464}{8}=58$

$\frac{580}{10}=58$

As we can see, in 1 hour, distance covered is 58 miles. Third answer choice is right.

If the 2 points are taken as $(x_{1},y_{1})$ and $(x_{2},y_{2})$

And we know formula of slope to be:

$\frac{y_{2}-y_{1}}{x_{2}-x_{1}}$

The slope of the line is:

$\frac{3-5}{8-2}=\frac{-2}{6}=-\frac{1}{3}$

The slope of the line is $-\frac{1}{3}$

Second answer choice is correct.

4. [this should be #5]

If the 2 points are taken as $(x_{1},y_{1})$ and $(x_{2},y_{2})$

And we know formula of slope to be:

$\frac{y_{2}-y_{1}}{x_{2}-x_{1}}$

The slope of this line can be found now:

$\frac{2.7-8.7}{-3.2-(-5.2)}=\frac{2.7-8.7}{-3.2+5.2}=\frac{-6}{2}=-3$

The slope of the line is

Fourth answer choice is correct.

The formula of slope is:

$\frac{y_{2}-y_{1}}{x_{2}-x_{1}}$

Where,

the 2 points are taken as $(x_{1},y_{1})$ and $(x_{2},y_{2})$

Now finding the slope:

$\frac{\frac{7}{3}-(-2)}{-3-\frac{3}{2}}=\frac{\frac{7}{3}+2}{-\frac{9}{2}}=\frac{\frac{13}{3}}{-\frac{9}{2}}=-\frac{26}{27}$

The slope of the line is $-\frac{26}{27}$

Second answer choice is right.

Point Slope form of a line is given as:

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

Where,

$(x_{1},y_{1})$ is the point given, andm is the slope

Using the point (5, 2) and slope as 3 given, we can write the equation:

y-2=3(x-5)

Fourth answer choice is right.

Point Slope form of a line is given as:

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

Where,

$(x_{1},y_{1})$ is the point given, andm is the slope

Using the point given as (-3,-5) and slope as $m=-\frac{2}{5}$ , we can write the point slope form of the equation as:

$y-(-5)=-\frac{2}{5}(x-(-3))\\y+5=-\frac{2}{5}(x+3)$

First answer choice is right.

Point Slope form of a line is given as:

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

Where,

$(x_{1},y_{1})$ is the point given, andm is the slope

The slope is given as -0.54 and the point is (4, -7). So the point slope form is:

$y-(-7)=-0.54(x-4)\\y+7=-0.54(x-4)$

First answer choice is right.

In this question, we can just have a quick look and see that the -coordinate is 8 times the -coordinate. So we can say that y=8x

Expanding the equations below would tell us which one is equal to that. Let's check.

$y-16=8(x-2)\\y-16=8x-16\\y=8x-16+16\\y=8x$

This is the correct one.

So first answer choice is right.

10.

The standard form of the equation of a line is given as:

Ax+By=C

Rearranging the given equation gives us:

$y=-\frac{2}{3}x+7\\\frac{2}{3}x+y=7$

Now, we can't have a fraction, so we multiply all of it by 3 to get rid of the denominator. Now we have:

$3*(\frac{2}{3}x+y=7)\\2x+3y=21$

First answer choice is right.

11.

The standard form of a line is Ax+By=C

Rearranging the given equation, we have:

$y=-\frac{1}{2}x+1\\\frac{1}{2}x+y=1$

We cannot have fractions, so we multiply the whole thing by 2 to get rid of the denominator. So we have:

$2*(\frac{1}{2}x+y=1)\\x+2y=2$

First answer choice is correct.

Answer from: Quest

Re-do the question and enter the picture

Answer from: Quest

Idon’t see a picture

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