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Oksi-84 [34.3K]
3 years ago
14

У= 5х – 3 3х – у = -1 Whats the value of y?

Mathematics
1 answer:
Katen [24]3 years ago
6 0

Answer:

(2,7) x=2 y=7

Step-by-step explanation:

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Solve this system of equations.
Dennis_Churaev [7]

Answer:

<em>x = -3 and y = 0</em>

Step-by-step explanation:

<em>It would be more direct to apply elimination in this problem, rather than substitution:</em>

  2x + 6y = -6       ⇒      2x + 6y = -6       ⇒      10x = - 30

+ 2(4x - 3y = -12)        +  8x - 6y = -24

<em>Now let us solve for x through simply algebra:</em>

10x = -30,

  <em>x = -3</em>

<em>Substitute this value of x into the first equation to get the value of y:</em>

2( -3 ) + 6y = -6,

-6 + 6y = -6,

  6y = 0,

    <em>y = 0</em>

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3 years ago
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3 years ago
A group of 2 adults and 4 children pay $95 for admission to a water park. A
il63 [147K]

Answer:

2a + 4c = 95

3a +7c =155

Step-by-step explanation:

2a + 4c = 95

3a +7c =155

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In triangle abc, m of acb = 90, cd is perpendicular to ab , m of acd is 60. and bd is 5 cm. find ad
weeeeeb [17]

Let us draw a picture to make the things more clear.

Attached is the image.

We have been given that

\angle acd = 60 ^{\circ}

Therefore, we have

\angle dcb =90- 60= 30 ^{\circ}

Now, in triangle bcd, we have

\tan30 = \frac{5}{cd}\\&#10;\\&#10;\frac{1}{\sqrt 3}=\frac{5}{cd}\\&#10;\\&#10;cd=5\sqrt 3

Now, in triangle acb, we have

tan 60 = \frac{ad}{5\sqrt3} \\&#10;\\&#10;\sqrt 3=  \frac{ad}{5\sqrt3}\\&#10;\\&#10;ad= 5\sqrt3 \times \sqrt 3\\&#10;\\&#10;ad= 5\times 3\\&#10;\\&#10;ad=15

Thus, ad is 15 cm.


4 0
3 years ago
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