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Wewaii [24]
3 years ago
5

Please Help!!!

Mathematics
2 answers:
kondor19780726 [428]3 years ago
6 0

Answer:

c = - 4

Step-by-step explanation:

Nothing else matters except that the number associated with the y value in equation one = 1 and the number in front of x is known in equation 1. Then we'll get around to looking at c

Add 2y to both sides of equation 1 (the top equation)

3x - 2y + 2y = 3 + 2y

3x = 2y + 3        

Now divide both sides of the equation by 2

3x/2 = y + 3/2

What's in front of x? It is (3/2)

So divide both sides of 6x + cy = 4       by c

6x/c + y = 4/c

Now put 6x/c on the right hand side so y is by itself.

y = -6x/c + 4/c

What do you have to do now?

You must equate -6x/c = 3/2x

Why?

The slopes have to be the same so the lines are parallel and never cross. That will give no solutions.

-6x/c = 3x / 2     Divide both sides by x

-6/c = 3/2           Cross multiply

3c = - 6 * 2        Combine

3c = - 12             Divide by 3

c = - 12/3

c = - 4

Lady bird [3.3K]3 years ago
3 0

Answer:

4

Step-by-step explanation:

3x - 2y = 3

6x + cy = 4

So 6x - 4y = 6

If c = 4, then It has no solution

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Follow the directions to solve the system of equations by elimination. 8x + 7y = 39 4x – 14y = –68 Multiply the first equation t
Leno4ka [110]

9514 1404 393

Answer:

  (x, y) = (1/2, 5)

Step-by-step explanation:

We observe that the y-terms have coefficients 7 and -14. If we want to eliminate the y-terms, we need to multiply 7 by a factor that makes it be the opposite of -14. That factor will be -(-14)/7 = 2.

After multiplying the first equation by 2, we have ...

  • 16x +14y = 78
  • 4x -14y = -68

Adding these two equations gives ...

  20x = 10

Solving for x, we need to divide by 20:

  x = 10/20 = 1/2

Substituting this into the first equation, we get ...

  8(1/2) +7y = 39

  7y = 35 . . . . . . subtract 4

  y = 35/7 = 5 . . . divide by 7

Then the solution is (x, y) = (1/2, 5).

_____

<em>Check</em>

We used the first equation to find y, so we know the x- and y-values satisfy the first equation. We need to check the result using the second equation.

  4(1/2) -14(5) = -68

  2 -70 = -68 . . . . . . . true; result checks OK

8 0
3 years ago
Can every number be represented as a decimal? explain
Sav [38]
Yes if its 10%,20%,30%,40%,50%,60%,70%,80%,90%,100%,but if its like 21%,29%,68%,74%,probably if your doing math
7 0
3 years ago
In 1985, the price of a gallon of milk cost about $2.20 per gallon. In 2005, the price of a gallon of milk cost about $3.50 per
Assoli18 [71]

the percent increase in the price of a gallon of milk from 1985 to 2005 is 59%

Define percent increase

Percent increase can be described as the rise in the value of an item, in this case the value is milk.

Write out the parameters

In 1985 the price of a gallon of milk is $2.20

In 2005 the price is $3.50

Formula for percent increase

new price-old price/new price × 100

Calculate the percent increase

new price= $3.50

old price= $2.20

= 3.50-2.20/2.20

= 1.3/2.20

= 0.59 × 100

= 59%

Hence the percent increase from 1985 t0 2005 is 59%

Please see the link below for more information

brainly.com/question/878172

6 0
3 years ago
Tell me the answer please. Give me a short answer and a step-by-step explanation.
EastWind [94]

Answer:

6 weeks

Step-by-step explanation:

100 + 5x = 10 + 20x

15x = 90

x=6

6 0
3 years ago
Select the correct answer.<br> What is the value of x ?
Vanyuwa [196]

Answer:

x=65

Step-by-step explanation:

In a triangle the three inside angles added together always equal 180. So 73+51+21+x=180

51+21+x=107

21+x=86

x=65

7 0
3 years ago
Read 2 more answers
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