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torisob [31]
3 years ago
8

Find the solution to the system 9x−4y=−13 and 9x−2y=−20

Mathematics
1 answer:
BaLLatris [955]3 years ago
3 0

Answer:

x = -3, y = -3.5.  As an ordered pair it is (-3, -3.5).

Step-by-step explanation:

9x − 4y = −13

9x − 2y =  -20

Subtract:-

-2y = 7

y = -3.5.

Substitute for y in the first equation:

9x - 4(-3.5) = -13

9x =  -27

x = -3.

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the perimeter of a rectangle is 54 meters. one side is 3 meters less than four times the length of the other side.
Firdavs [7]
54 = 2(4x-3) + 2(x)
54 = 8x-6 + 2x
60 = 10x
6 = x
so two sides are 6 meters, and the other 2 sides are 21 meters
3 0
3 years ago
Help pls not graded test
Arte-miy333 [17]

The missing angle of the given triangle  is 59°.

What is vertically opposite angles?

  Angles that are vertically opposed to one another are always equal to one another. A vertical angle and the angle to which it is next are also supplementary angles; that is, they sum up to 180 degrees. As an illustration, if two lines connect to form an angle, say X=45°, then the angle's opposite angle is also 45°.

Here consider angle with 31° and 49° triangle is 1. We know that sum of all angles in triangle is add upto 180°. Then,

⇒ 49°+31°+x = 180°

⇒ 80° + x= 180°

⇒x= 180°-80°=100°

Then unknown angle in triangle 1 ia 100°.

Now according to the vertically opposite angle theorem , opposite angles are equal to each other. Then ,

In triangle 2 angle is 100° and 21°. Then missing angle is,

⇒ 100°+21°+missing angle =180°

⇒Missing angle = 180°-100°-21°

⇒Missing angle = 59°

Therefore the answer is 59°.

To learn more about Vertical angle ,

brainly.com/question/18450499

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3 0
1 year ago
What is the answer to this problem?
Rufina [12.5K]
It increases then decreases then becomes constant
4 0
3 years ago
Solve equation for x. State any restrictions. ax+2=bx+c
Marina CMI [18]

it says i need to have at least 20 characters so here you go buddy

7 0
3 years ago
What is the value of X
sashaice [31]

Answer:

x = 7

Step-by-step explanation:

=> 9/72 = 3x-20/56

=> 9×45/72 = 3x-20

=> 27/3 = x

=> x = 7

3 0
2 years ago
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