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
klio [65]
3 years ago
11

The value of y varies directly with x, and y=28 when x=7. Find y when x=4 by first finding k.

Mathematics
1 answer:
lesya692 [45]3 years ago
7 0
Direct proportionality is the type of proportionality where an increase in one quantity or variable causes a corresponding increase in another quantity. 
Therefore; y varies directly as x
Hence; y α x
             y =k x where k is a constant 
if y= 28 and x = 7 , then k = 28/4 =4
hence, y = 4 k
when x = 4, then y= 16

You might be interested in
consider the point (x,y) lying on the graph of y=(x+3)^1/2. let L be the distance between the points (x,y) and (4,0). write l as
olga_2 [115]
L=\sqrt{ (x-4)^2 + y^2 }
and 
y=\sqrt{x+3} \Rightarrow x = y^2-3

L=\sqrt{ (x-4)^2 + y^2 }=\sqrt{ (y^2 - 3-4)^2 + y^2 }=\sqrt{ (y^2-7)^2 + y^2 }


6 0
3 years ago
What is the equation of the line that passes through the point (5,-2) and has a
tresset_1 [31]

Answer:

y = 6/5x - 2

Step-by-step explanation:

use y = mx+ c

m = slope

c = y intercept

y = 6/5x - 2

3 0
3 years ago
Read 2 more answers
What is the degree measure of z?. <br><br>A) 29° B) 39° C) 41° D) 68°
Lunna [17]

Answer:

D) 68°

Step-by-step explanation:

The exterior angle of a triangle is equal to the sum of the opposite interior angles

z = 39+29

z =68

8 0
3 years ago
Read 2 more answers
What is the decimal that is 1/10 of 0.9
oksian1 [2.3K]
.09:
"of" means that you have to multiply.

1/10 is equal to .1

If you multiply 0.1 by 0.9 you will get .09
6 0
3 years ago
the angel of elevation from where casey is standing to the top of an 84ft tall lighthouse is 58 degrees how far is casey standin
In-s [12.5K]

Answer: 52.489…

Step-by-step explanation:

Angle of elevation is 58 degrees, and the opposite value is 84 feet, so you’re lookin g for adjacent. That means you’ll use tangent to solve this equation:

Tan(58)=84/x

5 0
3 years ago
Read 2 more answers
Other questions:
  • Sally sold a decorated flowers that cost the same amount each plus a dozen roses for $28.All together she sold $73 in flowers.Ho
    12·1 answer
  • Which number line represents the solution to -3x ≤ -36?
    15·1 answer
  • PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!!
    8·1 answer
  • Evaluate the expression <br> |2x-8|<br><br> X=2
    12·2 answers
  • PLEASE HELP VERY CONFUESED
    5·2 answers
  • If Kim has 45 stickers and her sister steals 20 of them how many stickers does Kim have left?
    9·1 answer
  • Consider the following function: f(x) = x² - 4
    13·1 answer
  • Which of the following is a TRUE statement about the triangle below?
    12·1 answer
  • Find the rate of change for <br> growing 22.4 mm in 14 s
    11·1 answer
  • Question 6 of 20 :
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!