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
Elis [28]
3 years ago
11

4.2x -1.4y = 2.1 solve for y

Mathematics
3 answers:
Digiron [165]3 years ago
8 0

we have

4.2x-1.4y=2.1

Solve for y--------> clear the variable y

4.2x-1.4y=2.1

Subtract from both sides 4.2x

4.2x-1.4y-4.2x=2.1-4.2x

-1.4y=2.1-4.2x

Divide both sides by  -1.4

y=(2.1-4.2x)/(-1.4)

y=-\frac{2.1}{1.4} +\frac{4.2x}{1.4}\\ \\y= -1.5+3x\\ \\y=3x-1.5

therefore

<u>the answer is</u>

y=3x-1.5

Irina18 [472]3 years ago
7 0

we have

4.2x-1.4y=2.1

Solve for y--------> clear the variable y

4.2x-1.4y=2.1

Subtract from both sides 4.2x

4.2x-1.4y-4.2x=2.1-4.2x

-1.4y=2.1-4.2x

Divide both sides by  -1.4

y=(2.1-4.2x)/(-1.4)

y=-\frac{2.1}{1.4} +\frac{4.2x}{1.4}\\ \\y= -1.5+3x\\ \\y=3x-1.5

therefore

<u>the answer is</u>

y=3x-1.5

zzz [600]3 years ago
3 0
4.2x - 1.4y= 2.1....for y
-1.4y = -4.2x + 2.1
y = (-4.2/-1.4)x - 2.1/1.4
y = 3x - 1.5
You might be interested in
Element X is a radioactive isotope such that its mass decreases by 26% every day. If an experiment starts out with 810 grams of
ioda

Answer:

The hourly decay rate is of 1.25%, so the hourly rate of change is of -1.25%.

The function to represent the mass of the sample after t days is A(t) = 810(0.74)^t

Step-by-step explanation:

Exponential equation of decay:

The exponential equation for the amount of a substance is given by:

A(t) = A(0)(1-r)^t

In which A(0) is the initial amount and r is the decay rate, as a decimal.

Hourly rate of change:

Decreases 26% by day. A day has 24 hours. This means that A(24) = (1-0.26)A(0) = 0.74A(0); We use this to find r.

A(t) = A(0)(1-r)^t

0.74A(0) = A(0)(1-r)^{24}

(1-r)^{24} = 0.74

\sqrt[24]{(1-r)^{24}} = \sqrt[24]{0.74}

1 - r = (0.74)^{\frac{1}{24}}

1 - r = 0.9875

r = 1 - 0.9875 = 0.0125

The hourly decay rate is of 1.25%, so the hourly rate of change is of -1.25%.

Starts out with 810 grams of Element X

This means that A(0) = 810

Element X is a radioactive isotope such that its mass decreases by 26% every day.

This means that we use, for this equation, r = 0.26.

The equation is:

A(t) = A(0)(1-r)^t

A(t) = 810(1 - 0.26)^t

A(t) = 810(0.74)^t

The function to represent the mass of the sample after t days is A(t) = 810(0.74)^t

5 0
3 years ago
PLEASE HELP ME!! I WILL MARK THE FIRST CORRECT ANSWER BEAINLIEST!!))
sergey [27]

Answer:

7598.80

Step-by-step explanation:

V=πr^2h

= 3.14 * 11^2 * 20

= 2420π or 7598.80

6 0
2 years ago
Read 2 more answers
What number is needed to complete the pattern below 66 73 13 21 52 _1020
Dimas [21]
<span>Answer 61 73-66= 7 21-13 = 8 ?? -52= 9 20-10 = 10 ??=61</span>
6 0
3 years ago
Keith won a cash prize in an art competition. He gave his mother 2/5 of the money he won. Of the remainder, 1/4 was given to his
USPshnik [31]

Answer:

300 dollars

Step-by-step explanation:

Let the original amount = x

x - 2/5x  was what his mother's share looked.

5/5 x - 2/5 x

3/5x is what is left.

3/5 x - 1/4 * 3/5 x - 2/3x * 3/5 = his sister's share and his brothers

3/5x - 1/4*3/5 x - 2/3 * 3/5 = 15

3/5x * (1 - 1/4 - 2/3) = 15

3/5 x 5/60 = 15

15 / 300 * x = 15

1/20  x = 15

x = 15 * 20

x = 300

7 0
3 years ago
HELPPP
kow [346]

Answer:

the second one

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Other questions:
  • Within 11 years, the age of Peter will be half the square of the age he was 13 years ago. Calculate the current age of Peter. Re
    9·1 answer
  • Which equation can be used to find the number of fish in the pond on June 1?
    5·1 answer
  • Find the inverse of the function.<br> у= 2х^2-4
    8·1 answer
  • Where do the lines intersect?
    5·2 answers
  • Anyone know???? ???
    14·2 answers
  • A. zero<br> B. negative<br> C. positive
    15·2 answers
  • Mary Ann and Abigail were shopping for prom shoes and wondered how the prices at Payless compared to the prices at Famous footwe
    14·1 answer
  • Help quick it due! Please hurry lol
    14·1 answer
  • Nicolas has three fewer than twice the number of songs downloaded as Sabrina does.
    11·1 answer
  • X-3/18=12/9 solve for x
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!