7y 5 =y-4 By cross multiplication: 7y = 5(y - 4) 7y=5y-20 7y-5y=-20 2y=-20 =-20 2 =-10 =-10

Solve: 7y 5 =y-4

Question

Solve: $\frac{7\text{y}}{5}=\text{y}-4$

✓

Answer

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

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