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kari74 [83]
3 years ago
15

What is the solution to the system of equations? (7, 9) (9, 7) (–5, 11) (11, –5)

Mathematics
2 answers:
djverab [1.8K]3 years ago
8 0

Answer:

A.  (7,9)

Step-by-step explanation:

Got it on edg

ZanzabumX [31]3 years ago
4 0

Answer:

(7, 9)

Step-by-step explanation: To solve this system, I would use addition.

To solve a system of equations by addition,

we need one of our variables to cancel out.

Notice that we have a 4x in our first equation.

If we had a -4x in our second equation, the x's would cancel.

To create a -4x in the second equation,

we must multiply the entire equation by -4.

So we have (-4)(x + 6y) = (61)(-4).

Rewriting this equation, we have -4x - 24y = -244.

Now let's rewrite both equations.

4x - 5y = -17

-4x - 24y = -244

_____________

Now when we add the equations together, the x's cancel.

So we're left with -29y = -261.

Now divide both sides by -29 and we have y = 9.

To find x, we plug a y back in for x in either equation.

So let's go with our second equation, x + 6y = 61.

Plugging a 9 in for y, we have x + 6(9) = 61 or x + 54 = 61.

Subtracting 54 from both sides, we have x = 7.

So x = 7 and y = 9 which we can write as the ordered pair (7, 9).

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Write the polar form of a complex number in standard form for <img src="https://tex.z-dn.net/?f=8%5Bcos%28%5Cfrac%7B%5Cpi%7D%7B2
laila [671]

Answer:

Solution : 8i

Step-by-step explanation:

We can use the trivial identities cos(π / 2) = 0, and sin(π / 2) = 1 to solve this problem. Let's substitute,

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7 0
3 years ago
Evaluate 4.7 j−6.8k when j=5 and k=3
oksano4ka [1.4K]

Answer:

3.1

Step-by-step explanation:

ok so

4.7j-6.8k J=5 k=3 plug in the values

4.7(5)-6.8(3)

23.5-20.4

3.1

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2 years ago
Read 2 more answers
Evaluate the following expression when x = -5 and y = 25.
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Answer:

5

Step-by-step explanation:

5÷5x and 25÷5

1 × 5

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