3 years ago

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:

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

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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:

Step-by-step explanation:

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What is the volume of the rectangular prism? 1/ ft 10 ft ft 14 ft

Llana [10]

Answer:

10 $ft^3$

Step-by-step explanation:

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3 years ago

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frez [133]

Answer:

8units

Step-by-step explanation:

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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:

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