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Mathematics 8 Online
OpenStudy (anonymous):

HELP PLEASE!!!!!!!! Solve the following equation algebraically. See below

OpenStudy (anonymous):

\[\frac{ 2 }{3 }=2-\frac{ 5x-3 }{x-1 }\]

OpenStudy (anonymous):

do you want just the answer?

OpenStudy (anonymous):

i want to know how to solve it

OpenStudy (anonymous):

well first multiply by 3, then multiply by x-1, then collect like terms and isolate x

OpenStudy (anonymous):

ok so i need to multiply all sides by 3 and x-1

OpenStudy (anonymous):

i got 2(x-1)=3(2)+2(x-1)-3(5x-3)

OpenStudy (anonymous):

@Kuoministers can you help me please

OpenStudy (kuoministers):

hey mate

OpenStudy (anonymous):

hi

OpenStudy (kuoministers):

yea so just did what he said, which is to multiply everything by 3 and x-1

OpenStudy (kuoministers):

that would give you \[2 = 6 - \frac{ 15x-9}{ 3x - 3 }\]

OpenStudy (kuoministers):

hmm you would multiply everything by 3x - 3 :P now

OpenStudy (anonymous):

cant you cross multiply the 3 and x-1 at the same time

OpenStudy (kuoministers):

\[6x- 6=18x-18x+(15x - 9)(3x-3)\]

OpenStudy (kuoministers):

maybe but i dont think so as there is a 2 in the equation

OpenStudy (kuoministers):

\[6x - 6 = 18x - 18 + 45x ^{2} - 45x -27x + 27\]

OpenStudy (kuoministers):

\[0=45x ^{2} - 60 +15\]

OpenStudy (kuoministers):

now i think you can work it out

OpenStudy (kuoministers):

hint: 2 numbers you can use is 15 and 45

OpenStudy (anonymous):

should that be 60x

OpenStudy (kuoministers):

oh yes my bad

OpenStudy (kuoministers):

can you work it out now?

OpenStudy (anonymous):

yes thank u

jimthompson5910 (jim_thompson5910):

Hint: \[\Large \frac{ 2 }{3 }=2-\frac{ 5x-3 }{x-1 }\] Multiply every term by the LCD 3(x-1) to get \[\Large \frac{ 2 }{3 }*3(x-1)=2*3(x-1)-\frac{ 5x-3 }{x-1 }*3(x-1)\] \[\Large 2(x-1)=6(x-1)-3(5x-3)\]

OpenStudy (anonymous):

2x-2=6x-6-15x-9

OpenStudy (anonymous):

now i need to combine like terms

jimthompson5910 (jim_thompson5910):

should be +9 at the end, not -9

OpenStudy (anonymous):

so x=5/11

jimthompson5910 (jim_thompson5910):

yep

OpenStudy (anonymous):

so to check my answer i could replace x with 5/11 and it should work out to equal 2/3

jimthompson5910 (jim_thompson5910):

yes, ideally replacing each x with the supposed solution should make both sides equal to one another

OpenStudy (anonymous):

ok thank you very much

jimthompson5910 (jim_thompson5910):

you're welcome

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