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
Ray Of Light [21]
3 years ago
5

Solve the system of equations by substitution. X + y = 21 y = 6x

Mathematics
2 answers:
Inessa05 [86]3 years ago
8 0

Answer:

x=3

y=18

Step-by-step explanation:

x+y=21..........equation 1

or,x=21-y......equation 2

y=6x.......equation3

substituting the value of x in equation 3

y=6(21-y)

or,y=126-6y

or,7y=126

y=18

again,substituting the value of y in equation 2

x=21-y

or,x=21-18

x=3

x=3,y=18

eimsori [14]3 years ago
5 0

Answer:

x = 3

y = 18

Step-by-step explanation:

you replace y with 6x

x + 6x = 21

combine like terms

7x = 21

divide both sides by seven

x = 3

then you plyg 3 into the other equation

y = 6(3)

y= 18

You might be interested in
How to convert 90% into a decimal
Llana [10]

The first thing you  do is go two space forward  like start at the o and move two spaces  forward you put a decimal  at 9 like this 0.90 and that's  how  you  do  it

6 0
3 years ago
Read 2 more answers
(Y+9)x2=42 find the cross products
sveta [45]
2y+18=42
2y=24
y=12
Hope this helps!
8 0
3 years ago
The original price of a computer is $489.00. it is discounted 30%. find the selling price ​
Yanka [14]

Answer:

$342.30

Step-by-step explanation:

The original price of the computer is $489. The computer is discounted 30%, which means that 30% of the price is removed from the original price.

30% of 489 is

489 * 0.3 which is $146.7

146.7 is the discounted amount, not the selling price. To find the selling price, subtract how much is discounted ( 146.7) from the original price (489).

489-146.7= 342.3

3 0
2 years ago
Anyone know how to do trig? Given tan Ф = 4/5, find all other trig functions.
mars1129 [50]

9514 1404 393

Answer:

  • sin(Ф) = (4/41)√41; csc(Ф) = (√41)/4
  • cos(Ф) = (5/41)√41; sec(Ф) = (√41)/5
  • tan(Ф) = 4/5; cot(Ф) = 5/4

Step-by-step explanation:

The mnemonic SOH CAH TOA can help you with three of the functions. Then you need to remember the relations between those and the other three.

  Tan = Opposite/Adjacent

  tan(Ф) = 4/5

This suggests you can draw a triangle like the one attached that has adjacent side 5 and opposite side 4. Then hypotenuse can be found from the Pythagorean theorem:

  AC² = AB² +BC² = 5² +4² = 41

  AC = √41 . . . . . hypotenuse

Then the other trig functions are ...

  Sin = Opposite/Hypotenuse

  sin(Ф) = 4/√41 = (4/41)√41

  Cos = Adjacent/Hypotenuse

  cos(Ф) = 5/√41 = (5/41)√41

And the reciprocal functions are ...

  csc(Ф) = 1/sin(Ф) = (√41)/4

  sec(Ф) = 1/cos(Ф) = (√41)/5

  cot(Ф) = 1/tan(Ф) = 5/4

7 0
3 years ago
Can someone please help me with these 3 math questions? <br> ASAP!
Daniel [21]
I only see one question.
The answer is the root 4 has the multiplicity of 2.
7 0
3 years ago
Other questions:
  • Which of the following shows the equation below rewritten in the form ax^2+by+c=0 ? 2x^2+x+3=4(3x-5)
    7·1 answer
  • Find the LCD? P+3/p^2+7p+10 and p/5/p^2+5p+6
    9·1 answer
  • The Wright Flyer was the first successful powered aircraft. A model was made to display in a museum with the length of 35 cm and
    8·1 answer
  • Please I’m way lost on this one need help please
    7·2 answers
  • Brand B snowblower has a 7 horsepower engine that is being advertised as a 40% larger engine than Brand A. How many horsepower d
    12·1 answer
  • Pls help me solve this question
    8·1 answer
  • What is the solution to the system of equations? y = –5x + 3 y = 1 (0.4, 1) (0.8, 1) (1, 0.4) (1, 0.8)
    8·2 answers
  • Which is the least fraction 5/12 10/12 9/12 6/12
    10·2 answers
  • Write it as a mixed number please
    5·2 answers
  • Help plz help ......​
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!