Solving Rational Equations

bobbym · 2011-09-19 01:40:00

Hi;

What do you need it for? You can solve that without it.

zee-f · 2011-09-19 01:52:19

how??

zee-f · 2011-09-19 01:58:33

i want to get rid of the fraction

bobbym · 2011-09-19 01:59:23

Add the two on the left and solve.

But there are two quicker ways.

Subtract 1 / 9 from both sides.

If you cannot see the answer then continue with your algebra.

Cross multiply:

Now solve:

zee-f · 2011-09-19 02:15:20

sooo i would get

36x=9x+81

x=3

bobbym · 2011-09-19 02:25:56

Yes, but you did not look at what I did which makes the whole job easier. Please look at post #29.

zee-f · 2011-09-19 02:30:27

oooh i missed that yeah thats much easier thank you

bobbym · 2011-09-19 02:30:51

Next one.

zee-f · 2011-09-19 03:03:56

#9-

i choose c witch is 2/7

A x = 7
B x = 2
C x = 2/7
D x = 7/2
E x = 1/2
F x = 5/3

Last edited by zee-f (2011-09-19 03:04:20)

bobbym · 2011-09-19 03:06:29

That is not correct.

zee-f · 2011-09-19 03:13:18

i ment 7/2 my bad is 7/2 incorrect?

bobbym · 2011-09-19 03:13:47

7 / 2 is the correct answer.

zee-f · 2011-09-19 06:46:22

number ten lol i hope i did this right
i got 10- D

-2

10-

A----> x = 1
B----> x = -1
C----> x = 2
D----> x = -2
E----> x = 4
F----> x = -4

zee-f · 2011-09-19 07:06:56

11. Mrs. Smith has a stack of letters to be typed. If Anne takes 6 hours to type all of the letters and Mary takes 9 hours, how long should it take them working together to do the job?

i got #11-C
18/5 hours

A- 1 hour
B- 5/3 hours
C- 18/5 hours
D- 3 hours
E- 15/4 hours
F- 2/3 hours

zee-f · 2011-09-19 07:32:20

12. One optical scanner can read a stack of sheets in 20 minutes. A second scanner can read the same stack in 12 minutes. How much time would it take for both scanners together to process the one stack of sheets?

12-i got B

A--> 6 minutes
B--> 7.5 minutes
C--> 8 minutes
D--> 9 minutes
E--> 9.5 minutes
F--> 11 minutes

13. A laborer can do a certain job in 5 days, a second can do the job in 6 days, and a third in 8 days. In what time can the three together do the job?

13- i got E

A--> 1/19 days

B--> 2 days

C--> 4 days

D--> 5 days

E--> 120/59 days

F---> 2.5 days

bobbym · 2011-09-19 07:50:31

12 B is what I got.
13 E is what I got

zee-f · 2011-09-19 07:56:43

yup thats what i got what did u get for 10 and 11?

bobbym · 2011-09-19 08:04:26

10 is correct!
11 is correct!

zee-f · 2011-09-19 08:28:31

thank you i did 14-16

for #14- i got D

14. A tank can be filled by one pipe in 9 minutes and drained by another pipe in 12 minutes. Write an equation that could be used to determine how long it will take to fill the tank if the two pipes are open at the same time.

A-

b-

c-

D-

E-

F-

15- i got E- 36 min

15. Determine how long it will take the fill the tank in #14.

A-->44 minutes

B-->25 minutes

C--->18 minutes

D--->3 minutes

E---->36 minutes

F----->9 minutes

16. A tank can be filled by a pipe in 8 hours. The tank can be emptied by another pipe in 12 hours. If the pool is empty, and both pipes are open, how long will it take to fill the tank?

number #16 i got A

A 24 hours
B 30 hours
C 18 hours
D 14 hours
E 27 hours
F 32 hours

bobbym · 2011-09-19 08:32:18

14 I got D also.

I do not see your answer for 15?

zee-f · 2011-09-19 08:43:06

15- i got E- 36 min
number #16 i got A

Last edited by zee-f (2011-09-19 08:43:30)

bobbym · 2011-09-19 08:45:51

15 Is correct according to my calculations.

16 is also correct.

zee-f · 2011-09-19 08:50:21

thank you

am really stuck on #17-

Type A cream is 18% butterfat and type B cream is 24% butterfat. Set up a table to help you determine how many quarts of each type of cream must be used to create a 90 quart mixture that is 22% butterfat.

bobbym · 2011-09-19 08:55:24

Hi zee-f;

What do you have so far?

zee-f · 2011-09-19 08:58:20

i dont know how to solve it it looks really different from the other ones

Math Is Fun Forum

#26 2011-09-19 01:40:00

Re: Solving Rational Equations

#27 2011-09-19 01:52:19

Re: Solving Rational Equations

#28 2011-09-19 01:58:33

Re: Solving Rational Equations

#29 2011-09-19 01:59:23

Re: Solving Rational Equations

#30 2011-09-19 02:15:20

Re: Solving Rational Equations

#31 2011-09-19 02:25:56

Re: Solving Rational Equations

#32 2011-09-19 02:30:27

Re: Solving Rational Equations

#33 2011-09-19 02:30:51

Re: Solving Rational Equations

#34 2011-09-19 03:03:56

Re: Solving Rational Equations

#35 2011-09-19 03:06:29

Re: Solving Rational Equations

#36 2011-09-19 03:13:18

Re: Solving Rational Equations

#37 2011-09-19 03:13:47

Re: Solving Rational Equations

#38 2011-09-19 06:46:22

Re: Solving Rational Equations

#39 2011-09-19 07:06:56

Re: Solving Rational Equations

#40 2011-09-19 07:32:20

Re: Solving Rational Equations

#41 2011-09-19 07:50:31

Re: Solving Rational Equations

#42 2011-09-19 07:56:43

Re: Solving Rational Equations

#43 2011-09-19 08:04:26

Re: Solving Rational Equations

#44 2011-09-19 08:28:31

Re: Solving Rational Equations

#45 2011-09-19 08:32:18

Re: Solving Rational Equations

#46 2011-09-19 08:43:06

Re: Solving Rational Equations

#47 2011-09-19 08:45:51

Re: Solving Rational Equations

#48 2011-09-19 08:50:21

Re: Solving Rational Equations

#49 2011-09-19 08:55:24

Re: Solving Rational Equations

#50 2011-09-19 08:58:20

Re: Solving Rational Equations

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