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Nikolay [14]
3 years ago
13

I will mark you BRAINLIST please help with all 3 and show work on a paper please I need this thank you !!

Mathematics
1 answer:
o-na [289]3 years ago
8 0
I hope you can understand this :)

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If 2/x+ 3/y =13 and 5/x- 4/y = -2, then x+y equals
creativ13 [48]

Answer:

x + y =  \frac{5}{6}

Step-by-step explanation:

Let:

u =  \frac{1}{x}  \\ v =  \frac{1}{y}

This allows us to manipulate the equations like we normally would.

2u + 3v = 13 \\ 5u - 4v =  - 2 \\  \\   + 8u + 12v = 52 \\  + 15u - 12v =  - 6 \\ 23u = 46 \\ u = 2 \\  \\ 2(2) + 3v = 13 \\ 4 + 3v = 13 \\ 3v = 9 \\ v = 3

Then, we return the values where they belong.

u =  \frac{1}{x}  \\ 2 =  \frac{1}{x}  \\ x =  \frac{1}{2}  \\  \\ v =  \frac{1}{y}  \\ 3 =  \frac{1}{y}  \\ y =  \frac{1}{3}

Finally, we add:

\frac{1}{2}  +  \frac{1}{3}  =  \frac{3}{6}  +  \frac{2}{6}  =  \frac{5}{6}

7 0
3 years ago
A rectangle has a width of 3 inches and a length of x inches. The value of the perimeter of the rectangle is equal to the value
Damm [24]

Answer:

6

Step-by-step explanation:

6 0
3 years ago
What is the volume of the rectangular prism?<br> 1/<br> ft<br> 10 ft<br> ft<br> 14 ft
Llana [10]

Answer:

10ft^3

Step-by-step explanation:

8 0
3 years ago
Please help me anyone
frez [133]

Answer:

8units

Step-by-step explanation:

8 0
3 years ago
Help please thank you 20 points
stich3 [128]

Answer:

-25/8 and then -6/6 then 0/7 then 2 2/3


Step-by-step explanation:


6 0
3 years ago
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