EM-1661

Changing the subject of a formula

E Math · Secondary 4 · Hard · Changing the subject of a formula

It is given that

\dfrac{7}{m} = \dfrac{n+1}{2m-4}

.

(a) Express

n

in terms of

m

.

(b) Hence find

n

when

m = 6

.

$n = \dfrac{13m-28}{m},\; n = \dfrac{25}{3}$
$n = \dfrac{14m-28}{m},\; n = \dfrac{7}{3}$
$n = \dfrac{13m+28}{m},\; n = \dfrac{53}{3}$
$n = \dfrac{14m-28}{2m},\; n = \dfrac{25}{6}$

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