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
xz_007 [3.2K]
4 years ago
12

−8x + 3y = 21 solve it

Mathematics
2 answers:
Nataly [62]4 years ago
6 0
So first we have to subtract 3y from 21 cause the oppisit of addition which is subtraction so you get 18y when we divide that with -8y and get y=2.25y
tamaranim1 [39]4 years ago
5 0
-8x + 3y = 21
-8x + 8x + 3y = 21 + 8x
<u>3y</u> = <u>21 + 8x</u>
 3          3
  y = 7 + 2 2/3x
-8x + 3(7 + 2 2/3x) = 21
-8x + 21 + 8x = 21
-8x + 8x + 21 = 21
0x + 21 = 21
0x + 21 - 21 = 21 - 21
<u>0x</u> = <u>0</u>
 0     0
  x = 0
-8(0) + 3y = 21
0 + 3y = 21
<u>3y</u> = <u>21</u>
 3      3
  y = 7
(x, y) = (0. 7)
-----------------------------------------------------------------------------------------------
-8x + 3y = 21
-8x + 3y - 3y = 21 - 3y
<u>-8x</u> = <u>21 - 3y</u>
 -8         -8
   x = -2 5/8 + 3/8y
-8(-2 5/8 + 3/8y) + 3y = 21
21 - 3y + 3y = 21
21 - 0y = 21
21 - 21 - 0y = 21 - 21
<u>-0y</u> =<u> 0</u>
 -0    -0
   y = 0
-8x + 3(0) = 21
-8x + 0 = 21
<u>-8x</u> = <u>21</u>
 -8     -8
   x = -2 5/8
(x, y) = (-2 5/8, 0)
You might be interested in
When Steve woke up. His temperature was 102 degrees F. Two hours later it was 3 degrees lower. What was his temperature then?
Veseljchak [2.6K]
If the temperature dropped 3 degrees it is 99 degrees F
3 0
3 years ago
I need help please!!!!
elixir [45]

Answer:

297 ft squared

Step-by-step explanation:

find the area of the triangle, which is (bh)/2

(22*7)/2=77

find the area of the rectangle (bh)

22*10=220

add

77+220=297

4 0
2 years ago
Records show that Oliver is typically 10–30 minutes late for his shift at work. The distribution for the minutes he is late form
Margarita [4]

Based on the information given, the percentage of time that'll be required to meet the policy will be 10%.

From the complete information, the probability distribution will be:

= 1/(b - a) = 1/(30 - 10) = 1/20

Since the company policy requires employees to be less than 12 minutes late for work, the percentage of the time that Oliver will meet company policy will be:

= (12 - 10) × 1/20

= 2 × 1/20

= 1/10

= 10%

In conclusion, the correct option is 10%.

Learn more about percentage on:

brainly.com/question/24304697

6 0
2 years ago
cashews cost 4c per packet. mandy buys 4 packets of cashews. how much change does she recieve if she paid with a $20 bill? Give
Ivenika [448]
If c is cents (¢) then she would receive $19.74 or in cents that would be 1974¢
5 0
3 years ago
Anand needs to hire a plumber. He's considering a plumber that charges an initial fee of \$65$65dollar sign, 65 along with an ho
34kurt

This Question is Incomplete

Complete Question

Anand needs to hire a plumber. He's considering a plumber that charges an initial fee of $65 along with an

hourly rate of $28. The plumber only charges for a whole number of hours. Anand would like to spend no more than $250, and he wonders how many hours of work he can afford.

Let H represent the whole number of hours that the plumber works.

1) Which inequality describes this scenario?

Choose 1 answer:

A. 28 + 65H < 250

B. 28 + 65H > 250

C. 65 + 28H < 250

D. 65 +28H > 250

2) What is the largest whole number of hours that Anand can afford?​

Answer:

1) C. 65 + 28H < 250

2) 6 hours

Step-by-step explanation:

We are told in the question that:

Anand needs to hire a plumber. He's considering a plumber that charges an initial fee of $65 along with an

hourly rate of $28. The plumber only charges for a whole number of hours.

Hences we have:

$65 + 28 × H

We are told that:

Anand would like to spend no more than $250,

Hence,our equation becomes:

$65 + 28H ≤ $250

Where H = Hourly rates of the plumber.

1) Which inequality describes this scenario?

From the given options and our calculations above, Option C) 65 + 28H < 250 is the correct answer

2) What is the largest whole number of hours that Anand can afford?​

We would use our equation above to solve for this.

65 + 28H < 250

= 65 + 28H ≤ 250

We convert or inequality sign to equal to sign

= 65 + 28H = 250

28H = 250 - 65

28H = 185

H = 185/28

H = 6.6071428571 hours

Therefore, the largest whole number of hours that Anand can afford is 6 hours

6 0
3 years ago
Read 2 more answers
Other questions:
  • How do you show work for 604.8 divided by 36
    9·1 answer
  • Canada is the king of the doughnut world, as it has more doughnut shops per capita than any other country in the world. Tim Hort
    8·1 answer
  • Given f(x)=-2x+5 find the inverse
    9·1 answer
  • Which statement describes an outlier?
    14·1 answer
  • What is 12 14/15 as a decimal
    9·2 answers
  • The ratio of the lengths of the sides of a triangle ABC is 3:4:6. M, N, and K are the midpoints of the sides. Perimeter of the △
    9·1 answer
  • Which equation shows that 9 is a factor of 72
    7·1 answer
  • What is the last digit of
    10·1 answer
  • Freeeeeeeeeeee pointttttttttssss!!!!
    7·2 answers
  • Write the quadratic equation whose roots are -3 and 3, and whose leading coefficient is 5
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!