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aleksandrvk [35]
2 years ago
9

A. 6x 10y=9 B. 6x=9 C. -10y = 15 D. 2x= 15

Mathematics
2 answers:
Irina18 [472]2 years ago
8 0

Answer:

6x = 9

Step-by-step explanation:

4x-5y  = 12

2x+5y  = -3

Add the equations together

4x-5y  = 12

2x+5y  = -3

-------------------

6x + 0y = 9

6x = 9

Ksenya-84 [330]2 years ago
4 0

Answer:

B. 6x = 9

Step-by-step explanation:

4x - 5y = 12

+ 2x + 5y = -3

<u>_</u><u>_</u><u>_</u><u>_</u><u>_</u><u>_</u><u>_</u><u>_</u><u>_</u><u>_</u><u>_</u><u>_</u>

6x + 0 = 9

Hence, option B. 6x = 9 is the correct answer.

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Multiple choice 10 points
liubo4ka [24]

Answer:

f'(x) = 5    x<4

      = 2x    4<x<6

     = 4         x>6

Domain is all real numbers except 4 and 6

Step-by-step explanation:

We need to find the derivative of the piecewise function

f'(x) = 5    x<4

      = 2x    4≤x≤6

     = 4         x>6

Is the function continuous at 4

f(4-) = 5(4) - 6 = 20-6 = 14

f(4+) = 4^2 -2 = 16-2 = 14    

this is continuous, so there is no problem with the continuity here

Is the function continuous at

f(6-) = 6^2 -2 = 36-2 = 34

f(6+) = 4(6)+10 = 24+10 = 34

this is continuous, so there is no problem with the continuity here

Now we need to check the derivatives

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This is not continuous, so we get a piecewise definition for the derivative excluding 4

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