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kaheart [24]
2 years ago
7

Which of the expressions are equivalent to the one below? Check all that

Mathematics
1 answer:
Brums [2.3K]2 years ago
3 0

Answer:

A.5.8+5.3

Step-by-step explanation:

I'm very sure

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What is the answer a, b, c, or d
podryga [215]

Answer: Choice B

(-2, 5)

==================================================

Explanation:

The original system is

\begin{cases}-4x+3y = 23\\ x-y = -7\end{cases}

Multiply both sides of the second equation by 3. Doing so leads to this updated system of equations

\begin{cases}-4x+3y = 23\\ 3x-3y = -21\end{cases}

Now add straight down

The x terms add to -4x+3x = -1x = -x

The y terms add to 3y+(-3y) = 0y = 0

The terms on the right hand sides add to 23+(-21) = 2

We end up with the equation  -x = 2 which solves to x = -2

Now use this to find y. You can pick any equation with x,y in it

----------------

-4x+3y = 23

-4(-2)+3y = 23

8+3y = 23

3y = 23-8

3y = 15

y = 15/3

y = 5

Or

x-y = -7

-2-y = -7

-y = -7+2

y = -5

y = 5

Either way, we get the same y value.

So that's why the solution is (x,y) = (-2, 5)

6 0
3 years ago
Micheal has 5^(2) boxes. There are 5^1 of apples in each box. When empty, a box weighs 5^-2 kg. What is the total weight of boxe
Bond [772]

Answer:

5.4

Step-by-step explanation:

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7 0
3 years ago
Help please , I'm so confused
Bingel [31]
If u separate these into 2 triangles then they will become 90 degree triangles so angle a=angle c.
8 0
3 years ago
What is y= |x + 5| -4
krek1111 [17]

Answer: n = -9 x2 = -1

Step-by-step explanation:

i might be wrong idk that what i got for my answer

7 0
3 years ago
WILL GIVE BRAINIEST ONLY IF YOU GET IT RIGHT!!!!
LiRa [457]

Answer:

x = 15

Step-by-step explanation:

20^2 + x^2 = 25^2

400 + x^2 = 625

subtract each side 400

it results to 225

square root 225, to equals this -->

X = 15

5 0
2 years ago
Read 2 more answers
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