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
Rufina [12.5K]
2 years ago
14

Anyone know how to do the elimination method? pls help asap

Mathematics
2 answers:
givi [52]2 years ago
6 0
Hey there!

Check out image!


Answer is (-7,5)

dybincka [34]2 years ago
3 0

Answer:

(-7 , 5)

Step-by-step explanation:

For elimination method, you are "eliminating" one of the variables. This is achieved by relegating factors or multiples away so that both given expressions share the same term, which can be "eliminated".

In this case, you have the shared term of 7y. Isolate the term. Note the equal sign, what you do to one side, you do to the other.

For the first equation, Subtract 3x from both sides of the equation:

3x + 7y = 14

3x (-3x) + 7y = 14 (-3x)

7y = -3x + 14

For the second equation, subtract 2x from both sides of the equation:

2x + 7y = 21

2x (-2x) + 7y = 21 (-2x)

7y = -2x + 21

~

Note that both of them now share the same result, that being 7y. Using the equivalent system of equations (or expressions), you can solve them.

-3x + 14 = 7y

-2x + 21 = 7y

∴ -3x + 14 = -2x + 21

Isolate the variable, x. Note the equal sign, what you do to one side, you do to the other. Add 2x and subtract 14 from both sides of the equation:

-3x (+2x) + 14 (-14) = -2x (+2x) + 21 (-14)

-3x + 2x = 21 - 14

-x = 7

(-x)/-1 = (7)/-1

x = -7

~

Next, plug in -7 as x for one of the given equations to solve for y:

2x + 7y = 21

2(-7) + 7y = 21

First, simply by multiplying 2 with -7:

(2 * -7) + 7y = 21

(-14) + 7y = 21

7y - 14 = 21

Note the equal sign, what you do to one side, you do to the other. Do the opposite of PEMDAS. PEMDAS is the order of operations, and stands for:

Parenthesis

Exponents (& Roots)

Multiplication

Division

Addition

Subtraction

~

First, add 14 to both sides of the equation:

7y - 14 (+14) = 21 (+14)

7y = 21 + 14

7y = 35

Next, divide 7 from both sides of the equation:

(7y)/7 = (35)/7

y = 35/7 = 5

y = 5

~

Therefore, (-7 , 5) is your answer.

~

You might be interested in
The two lines intersected by the transversal are barrel. What is the value of x?
Vladimir79 [104]
The value of x is 11

Because both the angles should be equal
3 0
3 years ago
I literally don’t get this I need the answer
Ksju [112]

Answer:

62.83 units^{3}

Step-by-step explanation:

The equation is V(Volume) equals π (Pi/3.14) multiplied by r(radius) squared multiplied by h(height). The way it would be written out is V=π×r^{2}×h. So when you plug in the radius (2) and the height (5) you get π×2^{2}×5 which equals 62.83185 or 62.83. I hope this helps you understand and if you need more help let me know.

6 0
3 years ago
10 ÷ 1/5 I'm really dumb at math so try for brainly
yarga [219]
That equals 2 sweetheart. Your not dumb at all everyone has the potential
8 0
3 years ago
Read 2 more answers
mrs. diaz has 9 eggs. she cooks 5 eggs for breakfast. how many eggs are left? which model shows the problem?
melomori [17]

Answer:

B

Step-by-step explanation:

Because 9 = 5 +4

7 0
3 years ago
write the equation of a line that is perpendicular to the line y=-3/7-15 and that passes through the point (9,2)
SashulF [63]

Answer:

Step-by-step explanation:

First substitue the coordinates to the equation so

x=9, y=2

you would get

2=-3/7(9) + b

we put b because we are trying to find the new slope

multiply the two numbers above

2=-3/6/7 + b

subtract the whole number from both sides

b= 5/6/7

in equation would be

y= -3/7 + 5/6/7

Let me know if there is an error.

8 0
3 years ago
Other questions:
  • A rectangular field is 450 meters long and 400 meters wide. What is the area of the field in square kilometers?
    12·2 answers
  • What is the value of x3 + 5.2y when x = 2 and y = 3? 8.2 9.2 18.6 19.6
    11·2 answers
  • Kym used the integer tiles to find the sum of (–3) + 6. The line showed that the answer is negative 3. Which of the following do
    9·1 answer
  • Which of these is the composite function f(g(x))? f(x) = x2 – 5 g(x) = 9x – 2
    11·1 answer
  • A new design for the braking system on a certain type of car has been proposed. For the current system, the true average braking
    8·1 answer
  • You are busy baking cookies. You have baked 32 cookies and you want to make sure that each of your eight friend’s cookies look t
    10·1 answer
  • San Francisco is known for its fine chocolates. If a deluxe box of fancy chocolates weighs 1 pound 8 ounces and contains 32 choc
    12·1 answer
  • A pair of sunglasses cost $26 during the summer sale. If
    9·1 answer
  • PLEASE FAST IMAGE BELOW REAL ANSWERS PLEASE ||
    13·1 answer
  • $15,000 is invested for 15 years with an APR of 4.2% and monthly compounding.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!