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How do I simplify this expression? (1/5)(15x-35)-(1/6)(48x-5y)

 Jan 27, 2016

Best Answer 

 #1
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Simplify the following:
(15 x-35)/5-(48 x-5 y)/(6)

Put each term in (15 x-35)/5-(48 x-5 y)/6 over the common denominator 30: (15 x-35)/5-(48 x-5 y)/6  =  (6 (15 x-35))/30+(5 (5 y-48 x))/30:
(6 (15 x-35))/30+(5 (5 y-48 x))/30

(6 (15 x-35))/30+(5 (5 y-48 x))/30 = (6 (15 x-35)+5 (5 y-48 x))/30:
(6 (15 x-35)+5 (5 y-48 x))/30

6 (15 x-35) = 90 x-210:
(90 x-210+5 (5 y-48 x))/30

5 (5 y-48 x) = 25 y-240 x:
(-210+90 x+25 y-240 x)/30

Grouping like terms, -210+90 x-240 x+25 y = 25 y+(90 x-240 x)-210:
(25 y+(90 x-240 x)-210)/30

90 x-240 x = -150 x:
(25 y+-150 x-210)/30

Factor 5 out of 25 y-150 x-210:
5 (5 y-30 x-42)/30

5/30 = 5/(5×6) = 1/6:
Answer: | (-42-30x+5y) / 6

 Jan 27, 2016
 #1
avatar
+5
Best Answer

Simplify the following:
(15 x-35)/5-(48 x-5 y)/(6)

Put each term in (15 x-35)/5-(48 x-5 y)/6 over the common denominator 30: (15 x-35)/5-(48 x-5 y)/6  =  (6 (15 x-35))/30+(5 (5 y-48 x))/30:
(6 (15 x-35))/30+(5 (5 y-48 x))/30

(6 (15 x-35))/30+(5 (5 y-48 x))/30 = (6 (15 x-35)+5 (5 y-48 x))/30:
(6 (15 x-35)+5 (5 y-48 x))/30

6 (15 x-35) = 90 x-210:
(90 x-210+5 (5 y-48 x))/30

5 (5 y-48 x) = 25 y-240 x:
(-210+90 x+25 y-240 x)/30

Grouping like terms, -210+90 x-240 x+25 y = 25 y+(90 x-240 x)-210:
(25 y+(90 x-240 x)-210)/30

90 x-240 x = -150 x:
(25 y+-150 x-210)/30

Factor 5 out of 25 y-150 x-210:
5 (5 y-30 x-42)/30

5/30 = 5/(5×6) = 1/6:
Answer: | (-42-30x+5y) / 6

Guest Jan 27, 2016
 #2
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+5

I like Guests answer..!

 Jan 27, 2016

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