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
bixtya [17]
3 years ago
11

He simultaneous equations5x + y = 21x - 3y = 9 With working out​

Mathematics
1 answer:
Elza [17]3 years ago
8 0

Answer:

see explanation

Step-by-step explanation:

Given the 2 equations

5x + y = 21 → (1)

x - 3y = 9 → (2)

Multiply (1) by 3 and add the result to (2) to eliminate y term

15x + 3y = 63 → (3)

Add (2) and (3) term by term

(x + 15x) + )- 3y + 3y) = (9 + 63)

16x = 72 ( divide both sides by 16 )

x = 4.5

Substitute x = 4.5 into (1) for corresponding value of y

22.5 + y = 21 ( subtract 22.5 from both sides )

y = - 1.5

Solution is (4.5, - 1.5 )

You might be interested in
F(x) = 2x-1<br> What is f(13)?
Delicious77 [7]

Answer:

f(13)=2x-1, x=7

Step-by-step explanation:

7*2=14, 14-1=13

vise versa

f(13)=2(7)-1

4 0
3 years ago
Read 2 more answers
Can somebody answer this for me, please? <br><br> **_You get 20 Points_**
nevsk [136]
<h3>♫ - - - - - - - - - - - - - - - ~Hello There!~ - - - - - - - - - - - - - - - ♫</h3>

➷ Use this formula:

Area = ((a + b)/2) x h

a is the top length

b is the bottom length

h is the vertical height

1) Substitute in the values:

((3.8 + 6.2)/2) x 7 = 35ft^2 <== this is the answer

2) Substitute in the values:

((10.3 + 15.1)/2) x 12.6 = 160.02in^2 <== this is the answer

<h3><u>✽</u></h3>

➶ Hope This Helps You!

➶ Good Luck (:

➶ Have A Great Day ^-^

↬ ʜᴀɴɴᴀʜ ♡

3 0
3 years ago
Read 2 more answers
What is equivalent to 16/81
Lady_Fox [76]
There are a lot of things that are equivalent to 16/81.

16/81 = 0.197530864

Or we can keep multiplying 2 to the numerator and denominator:

16/81 = 32/162 = 64/324 = 128/648
4 0
3 years ago
Read 2 more answers
What is the value ??????? <br> Help!
larisa86 [58]

Answer:

please give brainiest

thank you

6 0
3 years ago
Read 2 more answers
Help I don't get it and I need it done fast.take your time if your going to help.
Zigmanuir [339]

Answer:

a

Step-by-step explanation:

4 0
3 years ago
Other questions:
  • What pair of factors of −42 has a sum of 1?
    12·1 answer
  • The system shown is____.<br>equivalent<br>independent<br>inconsistent
    7·1 answer
  • A contractor is building a wheelchair ramp for a doorway. To meet ADA
    14·1 answer
  • An open-top box is to be made from a 42-inch by 48-inch piece of plastic by removing a square from each corner of the plastic an
    9·1 answer
  • Help me asap please!1
    10·2 answers
  • a line with a slope of 1 passes through the point (14,11) . What is the equation in slope intercept form
    10·1 answer
  • Can someone help me pls?
    10·1 answer
  • Please help please help please help !!!!!!!
    12·1 answer
  • What is a linear equation that contains these points?​
    10·1 answer
  • Kelly worked on a straight 8 % commission. Her friend worked on a salary of $850 plus a 6% commission. In a particular month, th
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!