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enyata [817]
3 years ago
10

What is x+y=-20 and 6x-5y=-20 with elimination method

Mathematics
1 answer:
Lerok [7]3 years ago
4 0

Answer:

Step-by-step explanation:

x + y = -20......multiply by -6

6x - 5y = -20

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

-6x - 6y = 120 (result of multiplying by -6)

6x - 5y = -20

---------------add

-11y = 100

y = -100/11 <======

x + y = -20

x + (-100/11) = -20

x - 100/11 = -20

x = -20 + 100/11

x = -220/11 + 100/11

x = - 120/11 <========

solution is : x = -100/11 and y = -120/11 or (-120/11 , -100/11)

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3 years ago
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21 and 22 are complementary angles. The measure of Z1 is 45 The measure of Z2 is 3x°. Find the value of x. The figure is not dra
Alex

9514 1404 393

Answer:

  x = 15

Step-by-step explanation:

<u>Given</u>:

  ∠1 + ∠2 = 90°

  ∠1 = 45°

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<u>Find</u>:

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<u>Solution</u>:

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6 0
2 years ago
If arc EF = 151°, find mEDF.
user100 [1]
There is a theorem that says that this angle (formed by thre points on the circumference) is half such arc called EF.

We can deduct it as well.

1) Call O the center of the circle. The central angle (EOF) = arc EF = 151°

2) Draw a chord from F to D and other chord from D to E.

You have constructed two triangles, FOD and DOE.

3) Triangle FOD has two sides equals (because both are the radius of the circcle). Then, this is an isosceles triangle and it has two angles of the same measure. Call this measure a.

4) Triangle DOE is also isosceles, for the same reason explained in the poiint 3. Call the measure of its equal angles b.

5) The sum of the angles of the two triangles is 180° + 180 ° = 360°.

This is a + a + b + b + (360 - central angle) = 360°

=> 2a + 2b = central angle
=> 2(a+b) = cantral angle
=> (a+b) = central angle / 2 = 151° / 2 =71.5°

(a+b) is the angle that you are looking for.

Then the answer is 71.5°

 
4 0
3 years ago
128.5 divided by 4.5
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Answer:

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Solve for n n + 1 equals 4(n - 8)​
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Answer:

n = 11

Step-by-step explanation:

Step 1: Distribute

n + 1 = 4n - 32

Step 2: Isolate <em>n</em>

1 = 3n - 32

3n = 33

n = 11

And we have our final answer!

6 0
3 years ago
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