EM-1663

Changing the subject of a formula

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

It is given that

\dfrac{7}{x-1} = \dfrac{2y}{3x}

.

(a) Express

y

in terms of

x

.

(b) Hence find

y

when

x = 4

.

$y = \dfrac{21x}{2(x-1)}$ , and $y = 14$ when $x=4$
$y = \dfrac{14x}{3(x-1)}$ , and $y = 28$ when $x=4$
$y = \dfrac{21x}{x-1}$ , and $y = 28$ when $x=4$
$y = \dfrac{21(x-1)}{2x}$ , and $y = 7$ when $x=4$

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