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yarga [219]
3 years ago
13

EASY BRAINLIEST ANSWER ASAP!!

Mathematics
1 answer:
elena-14-01-66 [18.8K]3 years ago
4 0

Answer:

  1. (0, 4)
  2. (-1, 16/ 3)
  3. (-9/ 2, 10)

Step-by-step explanation:

In an ordered pair the term before the comma is the x variable and the term after the comma is the y variable.

1.

4x + 3y = 12 . . . . . .(0, _)

here were given the x variable

finding the other term

4× 0 + 3y = 12

3y = 12

y = 4

therefore the ordered pair is <u>(0, 4) </u>

2.

. . . . . . . (-1, _)

here were given the x variable

4 × -1 + 3y = 12

3y = 12 + 4

3y = 16

y = 16/ 3

ordered pair is <u>(-1, 16/ 3)</u>

3.

. . . . . . . . (_, 10)

here were given the y variable

finding the other term

4x + 3 × 10 = 12

4x + 30 = 12

4x = 12 - 30

4x = -18

dividing both sides by 2

2x = -9

x = -9/ 2

ordered pair is<u> (-9/ 2, 10)</u>

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In a pen of goats and chickens there are 25 heads and 90 feet. How many goats and chickens are in the pen.
Anna [14]

Answer:

5 chickens, 20 goats

Step-by-step explanation:

We can set up two equations and use substitution

There are 25 total goats and chickens, so

G + C = 25

Goats have 4 feet and chickens have two, so

4G + 2C = 90\\

By solving for G in the first equation,

G = 25 - C\\

We can now use substitution,

G = 25 - C\\4G + 2C = 90\\4(25 - C) + 2C = 90\\100 - 4C + 2C = 90\\-2C = -10\\C = 5\\

We have 5 chickens, so we have 20 goats.

Let's double check:

5(2) + 20(4) = 90\\10 + 80 = 90\\90 = 90\\

It checks out!

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Hello there, and thank you for posting your question here on brainly.

Short answer: C. 9

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