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OLga [1]
2 years ago
15

Please help me with 12 and 13!

Mathematics
2 answers:
erastova [34]2 years ago
3 0
12) (divide by 3)
x = 21, y = 7
x = 27, y = 9

13) (multiply by 8)
a = 6, b = 48
a = 8, b = 64
VLD [36.1K]2 years ago
3 0
12. 7 and 9. Here's why- 3x3=9, 3x5=15, 3x6=18, 3x7=21, 3x9=27. Everything is divisible by 3. 

13. I'm not sure about 13 but i hope I could help with 12. Hopefully someone can comment on this and figure out 13 for you.

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2 years ago
What is 2/5 plus 1/3
leva [86]
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So, what you need to do is take 2/5 and multiply the bottom by 3 to get 15, and since you did it to the bottom, you need to do it to the top too.   So you would get, 6/15.

Then, for 1/3, take the bottom number and multiply it by 5.  Then, since you did it to the bottom, do it to the top as well.  You would get 5/15.

Then, you need to put them side by side.  You don't add the bottom, so your denominator would remain 15, but your numerator (top) would get added.

<u> 6</u> + <u>5</u>     =   <u>11</u> 
15  15         15
6 0
3 years ago
Use the rules of exponents to evaluate or simplify. Write without negative exponents.
koban [17]

9514 1404 393

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4 0
3 years ago
2 x - 5 + 7 y - 3 = 9 x - 1 - y -8 Solve For X AND Y (SHOW WORK PLEASE)
Maru [420]

Answer:

\large\boxed{\sf x = \frac{8y+1}{7} }

\large\boxed{\sf x = \frac{7x-1}{8} }

<u>Group the Variable's</u>:

2 x - 5 + 7 y - 3 = 9 x - 1 - y -8

2x -9x + 7y +y = -1 -8 +5 + 3

-7x + 8y = -1

<u><em>From this find x and y</em></u>

<u>For X</u>

-7x + 8y = -1

-7x = -1 -8y

7x = 8y + 1

x = (8y +1)/7

<u>For Y</u>

-7x + 8y = -1

8y = -1 +7x

y = (7x -1)/8

3 0
2 years ago
Read 2 more answers
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