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
fenix001 [56]
3 years ago
15

How do I solve for 7y-4x=42 x=5y+9

Mathematics
1 answer:
8_murik_8 [283]3 years ago
8 0

Answer:

x=-21  y=-6

Step-by-step explanation:

7y-4(5y+9)=42

7y-20y-36=42

-13y=78

y=-6

x=5*(-6)+9

x=-30+9

x=-21

You might be interested in
a rectangular prism has a volume of 1374.28 cubic inches.The prism is 9.4 inches wide and 17.2 inches long.What is the height of
NISA [10]
The volume V of a prism can be found by:
The volume of a rectangular prism can be found through:
V=lwh
Where l is the length, w is the width, and h is the height.

The height can be found by rearranging the equation to:
h= \frac{V}{wl}

Take the volume (1374.28) and divide it by the length times the width (9.4*17.2=161.68).
1374.28/161.68= 8.5 inches is the height of the prism.
6 0
3 years ago
Help me find the slope
Alex Ar [27]
M= -6/5
hope this helped!!
4 0
3 years ago
Please please help me with this thank you
Alecsey [184]
The answer if i understand correctly is 17x7x24=2,856 square inch
or thats what the calculator told me
3 0
3 years ago
At a baseball game, 3 drinks and 4 hotdogs cost $15.00. At the same game, 3 drinks and 1 hotdog cost $10.50. Find the cost for a
Serhud [2]

Answer:

$3

Step-by-step explanation:

Given data

Let the cost of drinks be x

and the cost of hotdogs be y

so

3x+4y=15-------1

also

3x+y= 10.5------2

solve 1 and 2

 3x+4y=15

-3x+y= 10.5

     3y= 4.5

divide both sides by 3

y= 4.5/3

y= $1.5

Put y= 1.5 in 1

3x+4(1.5)=15

3x+6= 15

3x=15-6

3x= 9

x= 9/3

x= $3

Hence the cost of a drink is $3

8 0
3 years ago
If 32 teams participate in a standard single elimination tournament, how many games must be played to decide a champion?
SCORPION-xisa [38]
<h3>Answer: 31 games</h3>

======================================================

Explanation:

  • 32/2 = 16 games will happen in round 1. Afterward, 16 teams are left.
  • 16/2 = 8 games will happen in round 2. Afterward, 8 teams are left.
  • 8/2 = 4 games happen in round 3.
  • 4/2 = 2 games in round 4.
  • 2/2 = 1 game as the final championship.

Count the number of times you divide by two and we have five occurrences of this. So there five rounds overall.

To get the total number of games played, we add up the quotients

16+8+4+2+1 = 31

----------------

Or as a shortcut we can simply subtract off 1 since 1+2+4+...+2^n = 2^(n+1)-1

We can write that rule as

\displaystyle \sum_{k=1}^{n}2^k = 2^{n+1}-1

which is equivalent to

\displaystyle \sum_{k=1}^{n}2^{k-1} = 2^n-1

3 0
3 years ago
Other questions:
  • (a − 6)2<br><br> Find the product. (Simplify your answer completely.)
    9·2 answers
  • Help with this question!!
    8·1 answer
  • If f(c) = 0, which of the following statements must be true?
    12·1 answer
  • Find the equation of the line: With an x intercept of 4 and ay intercept of −1.5.
    5·2 answers
  • Find the sum of the first 90 terms of the sequence –4, –1, 2, 5, 8, ...
    5·2 answers
  • The table shows a proportional relationship between the number of meals
    13·1 answer
  • What is the inverse of the function y = 2x + 3?
    11·2 answers
  • WHO EVER GETS IT RIGHT GET BRAINLEST
    9·2 answers
  • PLZZZ HELPPP
    5·1 answer
  • Pls help I need to finish my homework
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!