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alukav5142 [94]
2 years ago
9

X=-9;y=4;z=8 -7z - 8y +5z

Mathematics
1 answer:
Ket [755]2 years ago
3 0

Answer:

Question

Bookmark

Solve the following equations:

9x+y−8z=0,

4x−8y+7z=0,

yz+zx+xy=47.

Easy

Solution

verified

Verified by Toppr

Correct option is

A

x=±3;y=±5;z=±4

Let 9x+y−8z=0 .......(i)

4x−8y+7z=0 .......(ii)

yz+zx+xy=47 .......(iii)

Solving (i) and (ii) by cross multiplication

7−64

x

=

−32−63

y

=

−72−4

z

=k

⇒

−57

x

=

−95

y

=

−76

z

=k

⇒x=−57k,y=−95k,z=−76k .........(iv)

Substituting x,y and z in (iii), we get

(−95k)(−76k)+(−76k)(−57k)+(−57k)(−95k)=47

⇒16967k

2

=47

⇒k

2

=

16967

47

=

361

1

⇒k=±

19

1

Substituting k in (iv), we get

⇒x=±3,y=±5,z=±4

which is the required solution.

Step-by-step explanation:

here is your answer Hope you will enjoy and mark me as brainlist

thank you

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5 0
3 years ago
PLEASE HELP ASAP
Igoryamba

Answer:

∠1 - 40°

Step-by-step explanation:

∠1 - 40°

b/c it's a right triangle and we have two angles given, 50° and 90°. Add them and subtract by 180° and get 40°.

∠2 - 140°

b/c an exterior (outside) angle is equal to the two most isolated / farthest angles added. The two most is angles are 105° and 35°, add them and get 140°.

∠3 - 40°

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∠4 -

b/c ∠' s 2 and 4 are vertical angles meaning they're equal so since ∠2 is 140°, so is ∠4.

∠5 - 35°

b/c we have two angles, 105° and 40°. Add them and subtract by 180° and get 35°.

~~

I hope that helps you out!!

5 0
3 years ago
What value of x is in the solution set of –5x – 15 > 10 + 20x?
Scilla [17]
Hello,

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==>-1>x
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6 0
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Answer:

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Step-by-step explanation:

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Answer:

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3 0
3 years ago
Read 2 more answers
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