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
jonny [76]
2 years ago
11

If y varies directly as x and y-21 when x is 7, find x when y = -5.

Mathematics
2 answers:
alukav5142 [94]2 years ago
8 0

Answer:

X=-5/3

Step-by-step explanation:

<h2>Y=KX where k is constant</h2><h2>y=kx</h2><h2>21=7k divide both sides by 7</h2><h2>to get 3</h2><h2>then equate</h2><h2>to get answer</h2>
klasskru [66]2 years ago
6 0

Step-by-step explanation:

Since, y varies directly as x:

\therefore \: y = kx..(1) \\ (k = constant \: of \: proportionality) \\ at \: y = 21 \: and \: x = 7 \\ 21 = k \times 7 \\ k =  \frac{21}{7}  = 3 \\ plugging \: k = 3 \: in \: equation \: (1) \\ y = 3x..(2) \\ plugging \:  \: y =  - 5  \: in \: (2)\\  - 5 = 3x \\ x =  \frac{ - 5}{3}  \\   \:  \:  \:  \:  \:  \: \huge \red{ \boxed{x =  -  \frac{5}{3} }}

You might be interested in
Is 1/5 less than 5/8
iren [92.7K]
1/5 is less then 5/8
3 0
3 years ago
How to solve proportions
Delicious77 [7]

Step-by-step explanation:

stating the ratios as fractions, setting the two fractions equal to each other, cross-multiplying, and solving the resulting equation

6 0
2 years ago
-2 es menor que 5. ​
Fed [463]

Answer:

Es mayor

Step-by-step explanation:

Si te sirvio la respuesta por favor dame coronita y sigueme༼ つ ◕_◕ ༽つ

6 0
2 years ago
Solve the system by substitution.<br> y = -3x +4<br> y = 2
erma4kov [3.2K]

Answer:

(2/3,2)

Step-by-step explanation:

3*2/3+4

simplify  2=2

5 0
2 years ago
Evaluate the function below for x = 2 F(x) = 4x3 - x2 - 5x + 7
Harrizon [31]
The answer to this question is 25.

4 0
3 years ago
Read 2 more answers
Other questions:
  • The equation of the blue line is y = –x + 5. Manipulate the orange line by setting the sliders so its slope, m, is –1 and its y-
    8·2 answers
  • I WILL GIVE BRAINLIEST
    14·1 answer
  • If there are 10 people in a race how many ways can 1st 2nd 3rd places be awarded
    10·1 answer
  • During the summer months, science center tickets are 3 for $36.75 and zoo tickets are 4 for $51.00. How much will a group of 12
    15·1 answer
  • Express the set using the roster method.
    15·1 answer
  • Answer Question 1. Pls
    7·1 answer
  • Meg and Rosa played a game. The game lasted 35 minutes and ended at 10:20 a.m.
    13·2 answers
  • 25,550 ÷ ___________ = 0.25550
    14·1 answer
  • Need help with ALL 3 questions, WILL AWARDS BRAINLY
    10·2 answers
  • Choose the point slope form of the equation below that represents the line that passes through the points (-6,4) and (2,0) Y+6=2
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!