1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Rom4ik [11]
3 years ago
5

How do you solve the system? y=9-2x x+5y=0

Mathematics
2 answers:
AnnyKZ [126]3 years ago
7 0
Well, so the x+5y= 0 you can make this into x=-5y and then plug this in into ( y=9-2x) the -2x , which these would become y=9-2(-5y) simplify and equals to y=9+10y. Then you simplify much smaller y=-9. Now that you have the y number you just plug this in into x=-5y, which these becomes x=-5(-9) and the answer is x=45. At the end you just need to find the x and y, so the answer is x=45 and y=-9      . Hopefully this would make this much easier to you. 
Pavlova-9 [17]3 years ago
6 0
I disagree because if you plug 45 into the x value on y=9-2x you don't get -9. But if x=5 and y= -1 then the equations make sense.

Y=9-2x
-1=9-2(5)
-1=9-10

X+5y=0
5+5(-1)=0
5-5=0
You might be interested in
Please help me to solve this​
zzz [600]

Answer:

Below in bold.

Step-by-step explanation:

First find the height by use Pythagoras theorem on the right triangle:

h = sqrt (5^2 - 4^2)

= sqrt 9

= 3.

Volume of the prism = area of the triangle * length

= 1/2 * 3 * 4 * 10

= 1/2 * 12 * 10

= 60 cm^3.

Total area = area of 2 triangles + area 0f 3 rectangles

= 2 * 1/2 * 3 * 4 + 3 * 10 +  4 * 10 + 5 * 10

= 12 + 30 + 40 + 50

= 132 cm^2.

3 0
3 years ago
How can you be able to find an area
muminat
You multiply the length and the width if it is a square. if you give the shape i can be more specific
6 0
3 years ago
Read 2 more answers
Two sides of a triangle are two consecutive number, whose area is 17.5cm². Find the numbers
AveGali [126]

Answer:

The numbers associated with the triangle are 5.437 and 6.437 centimeters, respectively.

Step-by-step explanation:

Two numbers are consecutives, when their difference is equal to 1. The area of the triangle is determined by the following formula:

A = \frac{1}{2}\cdot n \cdot (n+1)

A = \frac{1}{2}\cdot (n^{2}+n)

A = \frac{n^{2}}{2}+\frac{n}{2}

n^{2}+n = 2\cdot A

Where n is the shortest length of the triangle, measured in centimeters.

And we get the following second-order polynomial:

n^{2}+n -2\cdot A = 0 (1)

If we know that A = 17.5\,cm^{2}, then the shortest length of the triangle is:

n_{1} = 5.437\,cm and n_{2} \approx -6.437\,cm

Since length is a positive variable, the only possible solution is:

n\approx  5.437\,cm

Then, the numbers associated with the triangle are 5.437 and 6.437 centimeters, respectively.

6 0
3 years ago
4. What are the values of x and y? HELP PLEASE
Sergeeva-Olga [200]
The bottom answer is correct. I had some trouble with this so I had to find x and y in separate parts.

TO FIND X
notice that the top triangle and bottom triangles are similar, meaning if you multiple all three sides of one by a specific number, it becomes the same size as the bottom triangle.

17 x n = 8, therefore n=8/17
8 x n = X, therefore X=64/17

For some reason, this does not give a correct value for Y, so I had to use trig 

TO FIND Y 

Notice that the angle DAB is the same as DBC (lets call this angle Ø)

Using trig rule, we know that the cos of an angle is equal to the adjacent side divided by the hypotenuses.

We can now form some equations:

cosØ = 15/17 (from the top triangle)
cosØ = 8/Y      (from bottom triangle)
Now we know that Y=(8x17)/15 = 136/15

X=64/15  Y=136/15
8 0
3 years ago
A land developer is splitting up 90.18 hectares of
LekaFEV [45]

Answer:

we will divide the hectare of land bt 6to get the size of each property

90.18÷6 = 15.03

3 0
3 years ago
Other questions:
  • I need help. See attachment for detail.
    12·2 answers
  • ?? I'm stuck and I have no idea where to go from here
    12·1 answer
  • -3(x-2)=3x+3. Solve for x
    5·1 answer
  • 2/3 x 21=? find the product then write it in simplest form.
    8·1 answer
  • A population of 550 cheetahs decreases by 10% per year. How many cheetahs will there be in the population after 10 years
    6·1 answer
  • I have 12% cousin in my family I asked them what there favorite console is.Of the 12 cousins that participant 6 of them prefer x
    9·2 answers
  • A storekeeper increased the price of hats by 5%. Write an equation to calculate the increase of the total cost, c, when the pric
    14·1 answer
  • HELP DUE IN 10 MINUTES
    7·1 answer
  • 4(w-4) - 7w help me pleass
    12·1 answer
  • 4. Courtney wants to sell her grandfather's antique 1932 Ford. She begins to set her price by looking at ads and finds these pri
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!