Question
Solve:
$\frac{7\text{y}}{5}=\text{y}-4$
$\frac{7\text{y}}{5}=\text{y}-4$
✓
Answer
$\frac{7\text{y}}{5}=\text{y}-4$
By cross multiplication:
$\Rightarrow7\text{y} = 5(\text{y} - 4)$
$\Rightarrow7\text{y}=\text{5y}-20$
$\Rightarrow7\text{y}-5\text{y}=-20$
$\Rightarrow2\text{y}=-20$
$\Rightarrow\text{y}=\frac{-20}{2}=-10$
$\therefore\text{y}=-10$
By cross multiplication:
$\Rightarrow7\text{y} = 5(\text{y} - 4)$
$\Rightarrow7\text{y}=\text{5y}-20$
$\Rightarrow7\text{y}-5\text{y}=-20$
$\Rightarrow2\text{y}=-20$
$\Rightarrow\text{y}=\frac{-20}{2}=-10$
$\therefore\text{y}=-10$
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