how to make "a" the subject of the forumla 2a+5c=af+7c?

2008-12-06 12:55 pm

回答 (5)

2008-12-06 1:00 pm

✔ 最佳答案

2a + 5c = af + 7c
2a - af = 7c - 5c
2a - af = 2c

then factorise out a

a(2-f) = 2c

so a = 2c / (2-f)

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2008-12-06 1:03 pm

2a - af = 7c - 5c

a (2 - f) = 2c

a = 2c / (2 - f) ANSWER.

參考: Dont Ask...

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2008-12-06 3:21 pm

2a + 5c = af + 7c
2a - af = -5c + 7c
a(2 - f) = 2c
a = 2c/(2 - f)

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2008-12-06 3:13 pm

i need help with formulae myself

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2008-12-06 2:51 pm

2a - f a = 7c - 5c
(2 - f) a = 2c
a = 2c / (2 - f)

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