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nirvana33 [79]
3 years ago
7

joe sold half of her comic books, then she bought 18 more. She now has 36. With how many did she bigin?

Mathematics
2 answers:
Mice21 [21]3 years ago
5 0

Answer: Joe began with 36 books.

Step-by-step explanation:

x/2+18=36. 36+18=x. x/2-18=36.

Olin [163]3 years ago
5 0
36

x/2+18=36
-18. -18
(2)*(1/2x)=(18)*(2)
x=36
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8xy= 2(2x + y) solve for y
STatiana [176]

Answer:  \displaystyle y= \frac{2\text{x}}{4\text{x} - 1}

============================================

Work Shown:

8\text{x}y= 2(2\text{x} + y)\\\\8\text{x}y= 4\text{x} + 2y\\\\8\text{x}y - 2y= 4\text{x}\\\\y(8\text{x} - 2)= 4\text{x}\\\\y= \frac{4\text{x}}{8\text{x} - 2}\\\\y= \frac{2*2\text{x}}{2(4\text{x} - 1)}\\\\y= \frac{2\text{x}}{4\text{x} - 1}\\\\

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

Explanation:

The idea is to first get all the y terms to one side. I did this by subtracting 2y from both sides in the third step.

Then factor out y and divide both sides by (8x-2)

Afterward there's the optional steps of simplifying (as shown in the final two steps).

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2 years ago
Solve the system of equations. Show ALL your work. Put your answer in the form of an ordered pair (x, y)
stiv31 [10]
This should be easy because we just have to use substitution method. Substitute the value of x from the second equation into the x of the first equation. 
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6 0
4 years ago
How to memorize multiplication tables in one day?
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Brilliant_brown [7]
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4 0
3 years ago
Read 2 more answers
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Liono4ka [1.6K]

Answer:

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Step-by-step explanation:

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