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galina1969 [7]
3 years ago
13

Select the correct answer. The elimination method is ideal for solving this system of equations. By which number must you multip

ly the second equation to eliminate the y-variable, and what is the solution for this system? x + 3y = 42 2x − y = 14 A. Multiply the second equation by -3. The solution is x = 12, y = 9. B. Multiply the second equation by -2. The solution is x = 12, y = 10. C. Multiply the second equation by 2. The solution is x = 15, y = 9. D. Multiply the second equation by 3. The solution is x = 12, y = 10.(help i will give brainliest.)
Mathematics
2 answers:
Reptile [31]3 years ago
7 0

Answer:

c

Step-by-step explanation:

Multiply the second equation by 2. The solution is x = 15, y = 9.

vesna_86 [32]3 years ago
3 0

Answer: D

Step-by-step explanation:

It’s 3y so to get rid of the y variable you divide by what number is in front of it

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What's the surface area ratio &amp; the volume ratio??<br><br> please help me ASAP!!
Ulleksa [173]

Answer:

Step-by-step explanation:

Volumes of two spheres A and B = 648 cm³ and 1029 cm³

Things to remember:

1). Scale factor of two objects = \frac{r_1}{r_2} [r_1 and r_2 are the radii of two circles]

2). Area scale factor = \frac{(r_1)^2}{(r_2)^2}

3). Volume scale factor = \frac{(r_1)^3}{(r_2)^3}

Volume scale factor Or Volume ratio = \frac{V_A}{V_B}

                         \frac{(r_1)^3}{(r_2)^3}= \frac{648}{1029}

                         \frac{r_1}{r_2}=\sqrt[3]{\frac{648}{1029} }

                         \frac{r_1}{r_2}=\frac{6(\sqrt[3]{3})}{7(\sqrt[3]{3})}

                        \frac{r_1}{r_2}=\frac{6}{7}

Therefore, scale factor = \frac{r_1}{r_2}=\frac{6}{7}

                                      ≈ 6 : 7

Area scale factor Or area ratio = (\frac{r_1}{r_2})^2=(\frac{6}{7})^2

                                                   = \frac{36}{49}

                                                   ≈ 36 : 49

Volume scale factor or Volume ratio = \frac{648}{1029}

                                                             = \frac{216}{343}

                                                             ≈ 216 : 343

4 0
3 years ago
What is 67 divided by 6 and what is the remainder
ahrayia [7]
6 x 11= 66
67 - 66 = 1

67/6 = 11 
remainder= 1
7 0
3 years ago
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Find the mode of the following data . 12,8,4,8,1,8,9,11,9,10,12,8​
Y_Kistochka [10]

Answer:

8

Step-by-step explanation:

The mode of a set of data values is the value that appears most often

7 0
3 years ago
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Help!!I need this done by tomorrow .What is the area of the parallelogram shown?
makvit [3.9K]

Answer:

234 inches

Step-by-step explanation:

Area= base x height

Height= 18 inches

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The height of a parallelogram must be perpendicular to its base, the base of this parallelogram can only be 13 inches and the height is 18 inches. Since the side lengths are not straight lines the height must be found using this method.

The height of a triangle, parallelogram and trapezoid must have a height that is perpendicular to its base. Whereas it can be found by extending the length of the base or straightening the side length that is to be the height creating a right angle.  

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3 years ago
Required
Serjik [45]

Answer:

7/10 OR 0.7

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10,12,14,15,16,18,20

3 0
4 years ago
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