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
charle [14.2K]
3 years ago
5

4x + 5y = 3kx + 15y = 9 find k​

Mathematics
1 answer:
9966 [12]3 years ago
6 0

Answer:

12

Step-by-step explanation:

4x + 5y = 3 ................ (i)

kx + 15y = 9................(ii)

Dividing eqn (ii) by 3, we get,

k/3 x + 5y = 3.............(iii)

Subtracting eqn (iii) by eqn (i), we get,

-4x - k/3 x = 0

or, -(4 - k/3 )x = 0

or, 4 - k/3 = 0/x

or, 4 - k/3 = 0

or, 4 = k/3

or, k = 4*3

:. k = 12 (Ans)

You might be interested in
The vertices of figure BCDE have coordinates B(4, 4), C(−4, 4), D(−4, −4), and E(4, −4). The vertices of figure BꞌCꞌDꞌEꞌ have co
nikdorinn [45]
C.) A <span>dilation with a scale factor of 4, with center of dilation at the origin

Here, You can either draw the figure or compare the coordinates, 
B = (4, 4) then B' = (1, 1)
C = (-4, 4) then C' = (-1, 1)
D = (-4, -4) then D' = (-1, -1)
E = (4, -4) then E' = (1, -1)

So, Every coordinate is reducing by 4th factor... Hence, dilation factor is 4 about the origin

Hope this helps!</span>
4 0
3 years ago
At the bank, Sheila made 6 deposits, each in the same amount. Her sister Sherri made 5 deposits, each in the same amount. Each o
dmitriy555 [2]
A.6x=5(x+10)
b.6x=5x+50
    x=50
c. 6(50)=5((50)+10)
   300 = 5(60)
   300= 300
5 0
4 years ago
Which is the correct algebraic expression after combining like terms? 6+8x-7-x
Anarel [89]

Answer:

7x -1 is correct after combining like terms

Step-by-step explanation:

6+8x-7-x

To simplify algebraic expression we combine like terms

In the given expression

-x  or -1x  are same

8x  and -1x  are like terms

6 and -7 are also like terms

8x-1x= 7x

6 - 7 = -1

So 7x -1 is correct after combining like terms

3 0
3 years ago
A local Little league has a total of 60 players, 80% of who are right-handed. Write and solve a proportion that could be used to
ra1l [238]

Answer:

48 people are right handed. 12 are left handed

Step-by-step explanation:

80% of 60 is 48.

6 0
3 years ago
The formula of calculating the gradient of a line is
jeka57 [31]

Answer:

To calculate the gradient of a straight line we choose two points on the line itself. From these two points we calculate: The difference in height (y co-ordinates) ÷ The difference in width (x co-ordinates). If the answer is a positive value then the line is uphill in direction.

4 0
3 years ago
Other questions:
  • If a cube has a surface area of 150 in squared, what is the length of one of the sides
    10·1 answer
  • What is the ratio of 420kg and 450kg
    5·1 answer
  • Please help asap calculate the slope of the line through the points (6,-8) and (3,-4).
    15·1 answer
  • A doctor observes a graph that shows the electrical activity (in volts) of the heart of a patient over a period of time (in seco
    11·2 answers
  • Three years hence a father will four times as old as his son will be. Before two years he was seven times as old as his son was.
    9·2 answers
  • A camping ground began with 240 pounds of food and each day consumed about 12 pounds. After how many days did they have 180 poun
    6·2 answers
  • Chrissy bought plates for $7.29 and napkins for $2.74 for her party. Round each number to the nearest dollar. About how much cha
    10·2 answers
  • Find the missing angle​
    7·1 answer
  • Im stuck i dont know how to answer
    15·1 answer
  • What does (2x−2)(3x+5) equal?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!