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Mathematics 8 Online
OpenStudy (anonymous):

Solve For N . No ones been able to help me out with this question so far

OpenStudy (anonymous):

\[k=\frac{ 6n-5 }{ 4}\]

OpenStudy (phi):

step 1: multiply both sides by 4 what do you get ?

OpenStudy (anonymous):

|dw:1386889674257:dw|

OpenStudy (phi):

First, you multiply both sides of the equation. the k does not go away to multiply, write times 4 next to each term: \[ 4\cdot k=\frac{ 6n-5 }{ 4} \cdot 4 \]

OpenStudy (phi):

now as you know, 4 divided by 4 is 1. the right side simplifies.

OpenStudy (anonymous):

im lost how would this look like ?

OpenStudy (phi):

when you multiply fractions, you multiply top times top and bottom times bottom \[ 4\cdot k=\frac{ 6n-5 }{ 4} \cdot 4 \\ 4\cdot k=\frac{ 6n-5 }{ 4} \cdot \frac{4}{1} \\ 4\cdot k=\frac{ (6n-5)\cdot 4 }{ 4 \cdot 1} \\ 4\cdot k=\frac{ (6n-5)\cdot 4 }{4} \] notice you can simplify the fraction by "canceling" the 4's

OpenStudy (anonymous):

\[\frac{ 6k-5 }{ 4 }= n ? \]

OpenStudy (phi):

you can't just write down an expression Do you know this rule (with numbers, but it works with letters) you know \[ \frac{12}{4} =3 \] 12 is 3*4, so we could write this problem as \[ \frac{ 3\cdot 4 }{4} = 3 \] notice that 4 divided by 4 is 1, so we can "cancel" the 4/4 \[ \frac{3 \cdot \cancel{4}}{\cancel{4}}=3\] we use that same idea with your problem \[ 4\cdot k=\frac{ (6n-5)\cdot 4 }{4} \] the right side simplifies

OpenStudy (anonymous):

|dw:1386891036291:dw|

OpenStudy (anonymous):

|dw:1386891143935:dw|

OpenStudy (phi):

4*k is written (in algebra) as 4k but 4k means the same thing... 4 times k on the right side, another way to write it is \[ (6n-5)\cdot \frac{4}{4} \] which should make it more clear how to simplify it

OpenStudy (anonymous):

how would i mulityply the equation and the fraction ?

OpenStudy (phi):

so far you have \[ 4k = (6n-5) \cdot \frac{4}{4} \] I would simplify 4/4 to 1 and then multiply (6n-5) * 1 which is just 6n-5 Here is an example of how to do this type of problem http://www.khanacademy.org/math/algebra/solving-linear-equations-and-inequalities/solving_for_variable/v/example-of-solving-for-a-variable

OpenStudy (anonymous):

so was the equation |dw:1386891756409:dw|

OpenStudy (phi):

You started with \[ k=\frac{ 6n-5 }{ 4} \] after multiplying both sides by 4 you get \[ 4k = \frac{ 6n-5 }{ 4} \cdot 4 \\ 4k = \frac{ 6n-5 }{ \cancel{4}} \cdot \cancel{4}\\ 4k =6n-5 \]

OpenStudy (phi):

Your next step is to now add + 5 to both sides

OpenStudy (anonymous):

|dw:1386892758726:dw|

OpenStudy (phi):

can you show your work ?

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