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s344n2d4d5 [400]
3 years ago
12

GIVING BRAINLIST

Mathematics
2 answers:
Kitty [74]3 years ago
7 0
A function can't have x repeating any of the same number twice for example the first one
So the only right answer is A!
Anton [14]3 years ago
3 0

Answer:

a

Step-by-step explanation:

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Please help me on this question I really need help. :,)
Kazeer [188]

Answer:

a. (7, 27) Polly was incorrect.

b. (3, 1) Polly was correct.

Step-by-step explanation:

a.

y = 4x - 1

2x - y = -13

We can solve this by substitution. Our first equation gives us y. Plug that into our second equation for each instance of y.

2x - y = -13

2x - (4x - 1) = -13

First distribute the negative sign across the parentheses.

2x - 4x + 1 = -13

Combine like terms.

-2x + 1 = -13

-2x = -14

Divide both sides by -2.

x = 7

Now that we know x, plug its value into one of our original equations.

y = 4x - 1

y = 4(7) - 1

Solve.

y = 28 - 1

y = 27

Our solution is (7, 27).

Let's check our answer by plugging both values into one of our original equations.

2x - y = -13

2(7) - 27 = -13

Solve.

14 - 27 = -13

-13 = -13

Your solution is correct.

Polly's solution was (-2, -9), which is incorrect.

b.

3x + 6y = 15

-2x + 3y = -3

Let's solve this by elimination. To solve by elimination means to eliminate a variable from the equation.

We have 3x & -2x and 6y & 3y. Notice that 6 and 3 can be simplified easily. To eliminate y, we want to multiply each factor of the second equation by -2.

-2x + 3y = -3

-2(-2x + 3y = -3)

4x - 6y = 6

Write the equations together.

3x + 6y = 15

4x - 6y = 6

Now we can see that the y variable will cancel out.

Apply the elimination method.

3x + 6y = 15

4x - 6y = 6

________

7x = 21

Divide both sides by 7.

x = 3

Now that we know x, plug its value into one of our original equations.

3x + 6y = 15

3(3) + 6y = 15

Solve.

9 + 6y = 15

6y = 15 - 9

6y = 6

y = 1

Our solution is (3, 1).

Let's check our answer by plugging both values into one of our original equations.

-2x + 3y = -3

-2(3) + 3(1) = -3

Solve.

-6 + 3 = -3

-3 = -3

Your solution is correct.

Polly's solution was (3, 1), so she was correct.

Hope this helps!

6 0
2 years ago
How many lateral faces on a triangular prism
Eddi Din [679]

Answer:

there are eight lateral faces in prism

3 0
3 years ago
Read 2 more answers
What is The value of X?
Vladimir79 [104]

Answer:

Step-by-step explanation:

a) x=24

b) x=20

5 0
3 years ago
The fee for charging an electric car at station A is $2 to start and $4 for each hour or fraction of an hour. Which point is NOT
Alex777 [14]
I think it is D


I think ok
8 0
3 years ago
Us jevi has three apple
Fudgin [204]

Answer:

What do you need us to solve?

Step-by-step explanation:

5 0
2 years ago
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