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tigry1 [53]
3 years ago
12

Use the substitution method to solve the system of equations. y = -8x 4x - y = 3 O AG-2 O B. (6-1 oc c. (6.-4 D. G-4​

Mathematics
2 answers:
PtichkaEL [24]3 years ago
8 0

Answer:

x = 1/4

y = -2

Step-by-step explanation:

Triss [41]3 years ago
6 0
<h2>x = 1/4</h2><h2>y = -2</h2><h2>______________</h2>

<h2>Known : </h2>

y = -8x

4x - y = 3

<h2>Asked: </h2>

Use the substitution method to solve the system of equations ?

<h2>Answered:</h2>

<h3>Substitution y</h3>

4x - y = 3

4x - (-8x) = 3

4x + 8x = 3

12x = 3

x = 3/12

x = 1/4

<h3>Substitution x</h3>

4x - y = 3

4(1/4) - y = 3

4/4 - y = 3

1 - y = 3

-y = 3 - 1

-y = 2

y = -2

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All of the following ratio are equivalent to the ratio 5/8 EXCEPT
hammer [34]
The best answer here would be choice B
4 0
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Brrunno [24]

Since beta is in the first quadrant, the final answer will be positive.

To find cos(beta) so we can use the half angle identity, we can substitute into the Pythagorean identity. Doing so gives us that

\sin( \beta )  =  \frac{ \sqrt{17} }{5}

So, this means that

\sin( \frac{ \beta }{2} )  =  \sqrt{ \frac{1 -  \frac{ \sqrt{17} }{2} }{2} }  =  \sqrt{ \frac{2 -  \sqrt{17} }{4} }  =  \frac{ \sqrt{2 -  \sqrt{17} } }{2}

3 0
1 year ago
A bakery sells vanilla cupcakes and chocolate cupcakes. It sold 276 vanilla cupcakes in a day. 8% of the cupcakes sold that day
kkurt [141]

Answer:

hello!!!

300 cupcakes

please read the explanation.. it always helps... trust me...

Step-by-step explanation:

alrighty here it goes...

okay.. so we start by reading the problem (duh) but also underlining the important numbers that we need. yes, it really is that simple, trust me....

okay so the percentage of chocoalte cupcakes was 8% and the amount of vanilla cupcakes was 276.

we start by taking 100% - 8% = 92% so the amount of vanilla cupcakes sold was 276 which is also 92% of the total amount of cupcakes.

so now we need to find out 92% of what number gets us 276.

the percentage formula (in this problem) should be as follows:

92/100 x (total amount of cupcakes) = 276

to solve for total amount of cupcakes you do 276 x 100 then you divide by 92 to get your answer (which is 300)

i hope this helps!!!

4 0
1 year ago
Pqr is similar to xyz what is the perimeter of xyz? A.21cm B.63cm C. 105cm D.126cm
skelet666 [1.2K]

Answer:

option D. 126 cm

Step-by-step explanation:

step 1

Find the scale factor

we know that

If two figures are similar, then the ratio of its corresponding sides is proportional and this ratio is called the scale factor

In this problem

Triangles PQR and XYZ are similar by AA Similarity Theorem

so

\frac{XY}{PQ}=\frac{YZ}{QR}=\frac{XZ}{PR}

Let

z ---> the scale factor

z=\frac{XY}{PQ}

substitute the given values

z=\frac{30}{5}=6

step 2

Find the perimeter of triangle XYZ

we know that

If two figures are similar, then the ratio of its perimeters is equal to the scale factor

Let

z ----> the scale factor

p_1 ----> the perimeter of triangle XYZ

p_2 ---> the perimeter of triangle PQR

so

z=\frac{p_1}{p_2}

The perimeter of triangle PQR is

p_2=5+10+6=21\ cm

we have

z=6\\p_2=21\ cm

substitute

6=\frac{p_1}{21}

p_1=6(21)=126\ cm

therefore

The perimeter of triangle XYZ is 126 cm

5 0
3 years ago
please help asap i’m about to give up on this entire assignment i’ve been on this same question for like 20 minutes now and i’ve
andre [41]

Answer:

  • C and D

Step-by-step explanation:

<u>Area of the top section:</u>

  • A₁ = x*(x - x + 3) = x*3 = 3x in²

<u>Area of the bottom section:</u>

  • A₂ = (x + 4)(x - 3) = x² + x - 12 in²

<u>Total area:</u>

  • A = A₁ + A₂ =
  •      (3x) + (x² + x - 12) in²

Correct choices are C and D

8 0
2 years ago
Read 2 more answers
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