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Help with just one algebra question??? Please?
I have the answer to it, I still just don t understand how they get it though. It s a review question for my math final later today.
Solving for x:
(8-x) / 2 = (3x+9) / 5
the answer is : 2
please help me out!
2 Answers
- RogueLv 74 years agoFavorite Answer
(8 − x)/2 = (3x + 9)/5
Multiply both sided by LCM(2,5) = 10
∴ 5(8 − x) = 2(3x + 9)
Expand the parenthesis
∴ 40 − 5x = 6x + 18
add 5x to both sides
∴ 11x + 18 = 40
subtract 18 from both sides
∴ 11x = 22
divide both sides by 11
∴ x = 2
- Randy PLv 74 years ago
You could do it all in terms of decimals or fractions, but it's a little easier if you get rid of the fractions. Multiply both sides by 2*5, the common denominator of 2 and 5.
(8-x)*10/2 = (3x+9)*10/5
5(8-x) = 2(3x+9)
40 - 5x = 6x + 28
40 = 11x + 28
22 = 11x
2 = x
