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charle [14.2K]
3 years ago
8

Solve the simultaneous equations 8x+3y=45 2x+3y=27

Mathematics
1 answer:
Vedmedyk [2.9K]3 years ago
4 0

Answer:

x = 3 and y = 7

Step-by-step explanation:

Given that,

8x+3y=45 .......(1)

2x+3y=27 ........(2)

We need to solve equations (1) and (2)

Multiply equation (2) by 4.

8x+12y=108 .....(3)

Subtract equation (1) from (3).

8x+12y-(8x+3y)=108-45

12y-3y = 63

9y = 63

y = 7

Put the value of y in equation (1).

2x+3(7)=27

2x+21 = 27

2x = 27-21

2x = 6

x = 3

So, the values of x and y are 3 and 7 respectively.

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Which steps would you use to solve this equation? Check all that apply.
Dovator [93]

Answer: The answers are

  1. Subtract 7 from both sides of the equation.
  2. Subtract 7 from 7.
  3. Substitute 5 for p to check the solution.

Step-by-step explanation:

p + 7 = 12

=   p + 7 - 7 = 12 - 7

=   p = 5

Then for the substituting part

5 + 7 = 12

Hope this helps!

3 0
3 years ago
I don’t know this one
Taya2010 [7]
74 degrees, because angle 1 and 8 add up to 73 degrees, so to make 180 you subtract 180-73 degrees, which makes 112 degrees for angle 9. Angle 9 and 12 are supplementary so they should both add up to 180. That means that angle 12 must be 68. Angles 12, 7, and 6 must add up to 180, so 38+68=106. 180-106=74. Therefore, angle 6 is 74 degrees
3 0
4 years ago
A cylindrical bin with a diameter of 15 feet 3 inches and a height of 24 feet 4 inches is used to hold wheat on the farm where y
Zepler [3.9K]

Given

A cylindrical bin with a diameter of 15 feet 3 inches and a height of 24 feet 4 inches is used to hold wheat.

One cubic foot holds 0.804 bushels

Find out bushels of wheat can be stored.

To proof

Formula

Volume\ of\ a\ cylinder = \pi r^{2}h

where r is the radius and h represent the height.

As given in the question

diameter = 15 feet 3 inches

height = 24 feet 4 inches

First convert inches into feet

I inches = 0.083 feet

15 feet 3 inches = 15 + 3 × 0.083

                          =    15.25 feet

Diameter = 15.25 feet

24 feet 4 inches = 24  + 4 ×0.083

                           = 24.33 feet

Height = 24.33 feet

Radius\ of\ cylinder = \frac{Diameter}{2}

Radius = 7.63 feet

\pi = 3.14

Put all the value in the above formula.

we get

Volume of the cylinder = 3.14× 7.63× 7.63× 24.33

                                      = 4447.55 foot³ ( approx)

As given

One cubic foot holds 0.804 bushels

Total bushels of wheat can be stored = 4447.55×0.804

                                                               = 3575.83 ( approx)

Total bhushels of wheat stored are  3575.83 ( approx).

Hence proved

6 0
3 years ago
Read 2 more answers
HELP ASAP<br> Solve the equation for x.<br> 3x - 5x + 4 = 10 x = <br> PLEASE ANSWER STEP BY STEP
Doss [256]

Answer:

X=-3

Step-by-step explanation:

3x-5x+4=10

-2x=6

x=-3

note:  I wasn’t sure if the equation ended in 10 or 10x. I think it ends at 10 so that is how I solved.

3 0
3 years ago
The grid shown below is in the shape of a rectangle.
anzhelika [568]

Answer:

your answer will be B.24

Step-by-step explanation:

have a nice day bye!! ^_^

5 0
3 years ago
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