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
Leya [2.2K]
3 years ago
10

Solve the equations 3x + 5y = 21 -20x + 5y show your work

Mathematics
1 answer:
Digiron [165]3 years ago
8 0

Answer:

x=21/23

Step-by-step explanation:

Solve for x:

3x+5y=21−20x+5y

Add 20x to both sides:

3x+5y+20x=−20x+5y+21+20x

23x+5y=5y+21

Subtract 5y to both sides:

23x+5y+−5y=5y+21+−5y

23x=21

Divide both sides by 23:

x=21/23

You might be interested in
Gino bought 1/2 lb of​ candy, 3/4 lb of​ nuts, and 7/8 lb of granola to make a trail mix. How many pounds of trail mix did Gino​
Yakvenalex [24]
1/2 + 3/4 + 7/8
4/4(1/2)+ 2/2(3/4) + 7/8
4/8 + 6/8 + 7/8

4+ 6 + 7
—————
8

17 1
——. Or 2—-
8 8


He prepared 2 1/8 lbs of trail mix
4 0
3 years ago
If g(x)=−3x+9 g ( x ) = − 3 x + 9 and f(x)=2x+7 f ( x ) = 2 x + 7 , what is the value of g(f(x)) g ( f ( x ) ) ?
olya-2409 [2.1K]
G(f(x)) = g(2x +7) = -3(2x +7) +9 = -6x -21 +9

g(f(x)) = -6x -12
5 0
3 years ago
Please help!!!!!!!!!!!!!!!! 100pts,
Helga [31]

QUESTION:

The code for a lock consists of 5 digits (0-9). The last number cannot be 0 or 1. How many different codes are possible.

ANSWER:

Since in this particular scenario, the order of the numbers matter, we can use the Permutation Formula:–

  • P(n,r) = n!/(n−r)! where n is the number of numbers in the set and r is the subset.

Since there are 10 digits to choose from, we can assume that n = 10.

Similarly, since there are 5 numbers that need to be chosen out of the ten, we can assume that r = 5.

Now, plug these values into the formula and solve:

= 10!(10−5)!

= 10!5!

= 10⋅9⋅8⋅7⋅6

= 30240.

3 0
3 years ago
Which relation is a function?
Luden [163]

A relation is <em>not</em> a function if it has repeated "x" values.

A. (3, _) repeats

B. is a function

C. (5, _) repeats

D. (-4, _) repeats

8 0
3 years ago
Evaluate 6(5-(6-5)-3​
IrinaK [193]

Answer:

Step-by-step explanation:

Evaluate 6(5-(6-5)-3​) =  6(5-1-3​)   {first solve innermost bracket}

                               = 6* (5-4) = 6*1 =6

4 0
3 years ago
Read 2 more answers
Other questions:
  • Using the given​ diagram, solve for x.
    9·2 answers
  • Pleaseeee help!!!! I will mark you as brainlinest for correct answer!!!!!
    7·2 answers
  • Martin runs 100 meters in 15 seconds. What is the equation for d, the distance in meters that Martin covers per second.
    12·1 answer
  • The point (−7, -24) is on the terminal side of angle θ, in standard position. What are the values of sine, cosine, and tangent o
    5·1 answer
  • I need help plz help
    13·1 answer
  • Classify the number as natural, whole, integer, rational, and/or irrational.
    12·2 answers
  • Aisha saves 2 Dhs on first week of the month of June, 4Dhs on second week of the month, 8 Dhs on third week of the month and so
    12·1 answer
  • *find the area thats all *
    11·1 answer
  • A rectangular prism is 12 inches long, 9 inches wide, and 6 inches high. What is the volume of the prism?
    5·1 answer
  • Which statements are true about points A, B, and C? Check all that apply. The coordinates of point A are (3, –3). The coordinate
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!