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
Talja [164]
1 year ago
7

Solve the system using elimination.5x-9y=12x-9y=-12

Mathematics
1 answer:
NemiM [27]1 year ago
4 0

Answer:

x = 6

y = 2

Explanation:

To solve the system using elimination, we need to multiply the second equation by -1, so the second equation is equivalent to:

x - 9y = -12

-1 (x - 9y) = -1 (-12)

-x + 9y = 12

Then, we can sum this equation and the first equation. So:

5x - 9y = 12

-x + 9y = 12

4x + 0 = 24

So, we can solve for x, as:

4x = 24

4x/4 = 24/4

x = 6

Then, we can replace x by 6 on the first equation and solve for y, so:

5x - 9y = 12

5(6) - 9y = 12

30 - 9y = 12

30 - 9y - 30 = 12 - 30

-9y = -18

-9y/(-9) = -18/(-9)

y = 2

Therefore, the solution of the system is x = 6 and y = 2

​

You might be interested in
(1-cos0)(1+cos0) pls help​
topjm [15]

Answer:

sin²Ф

Step-by-step explanation:

I doubt that you actually meant "cos 0" ... that has a value of 1.

If you meant  (1-cos Ф)(1+cos Ф), then this product is 1 - cos²Ф.

That, in turn, is equal to sin²Ф

6 0
3 years ago
What is the length of segment AB?
Scorpion4ik [409]

Point A is at (12,12)

Point B is at (48,24)

Use the distance formula √((x2-x1)^2 + (y2-y1)^2)

Length = √((48-12)^2 + (24-12)^2)

Length = √(36^2 + 12^2)

Length = √(1296 + 144)

Length = √1440

The answer is E.

5 0
3 years ago
What is the surface area of the figure shown? (use 3.14 for pi)
SpyIntel [72]

This is a combination of the formula of several figures.

The first one is the bottom of the cylinder AKA a circle.
The second one is the cylinder - the bottom and the top.
The third one is a cone without a bottom.

The first one can be written like this: r^2*3.14 where r is the radius of the circle
The second one is written like this: 2*3.14*r*h where r is the radius, and h the height
The third one is written like this: l*r*3.14

After this you just have to input the values. 
bottom        cylinder        Cone             (Use calculator if possible)
(3^2*3.14)+(2*3.14*3*5)+(6*3*3.14)=
28.26 + 94.2 + 56.52 = 178.98 in^2

The correct answer is 178.98 in^2.
Youre welcome. 




EXTRA:

If youre wondering how to find the different formulas, you can search for the full formula, then remove the parts you do not need, by matching them with the formula of the part you want to remove.

Example:
Cylinder:
SA = 2(pi<span> r</span><span> 2</span><span>) + (2 </span><span>pi </span><span>r)* h
</span>In this case, i didnt need the top and bottom, then i look for the formula of a circle.
Circle SA = pi r^2

Is this anywhere in the cylinder? Yes! The first part.
Then we are left with:
2 + (2 pi r)*h
But that 2 looks strangely placed, and with some reason, one quickly understands that it means "top AND bottom", but since we removed the circle surface, we have to remove that part too. 
So the final result of the formula is:
2 pi r h


4 0
3 years ago
D) y= x - 3/2 <br><br><br><br> HELP ME PLS
Alla [95]

Answer:

i think it's A

Step-by-step explanation:

5 0
2 years ago
Read 2 more answers
Please someone help!!
egoroff_w [7]
To negatives equal a positive. Convert both of the mixed numbers into a improper fraction. Cross simplify 5 and 5, they both turn into one’s. Multiply and you should get 7/3 or 2 1/3.
7 0
3 years ago
Read 2 more answers
Other questions:
  • I️ need help with the your turn part
    12·1 answer
  • find the equation of a line given the point and slope below. arrange your answer in the form y = mx b, where b is the constant.(
    9·1 answer
  • MATH HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    5·1 answer
  • Find the MAD:<br>58, 38, 54, 48, 26, 36​
    13·2 answers
  • Can someone help me with this one?
    5·1 answer
  • 1. Find the intercepts of 6x - 2y = -24.
    5·1 answer
  • A triangle with side lengths of 3, 4, and 5 forms a right triangle.<br><br> True<br> False
    12·2 answers
  • A ship is stationary at sea.
    14·1 answer
  • A circle is centered at the vertex of an angle, and the angle's rays subtend an arc that is 74.46 cm long. 1/360th of the circum
    7·1 answer
  • A cement mixture costs $33 a ton. It is composed of Grade A cement at $36 a ton and Grade B cement at
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!