EM-1659

Changing the subject of a formula

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

1. $y = \dfrac{8x}{x+3},\; y=5$
2. $y = \dfrac{8x}{x-3},\; y=20$
3. $y = \dfrac{4(x+3)}{2x},\; y=4$
4. $y = \dfrac{2x}{x+3},\; y=\dfrac{5}{4}$

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