[tex]x \times y = 35[/tex]
[tex]x = \frac{5}{7}y[/tex]
[tex] \frac{5}{7} y \times y = 35[/tex]
[tex] {y}^{2} = 35 \div \frac{5}{7} [/tex]
[tex] {y}^{2} = 35 \times \frac{7}{5} [/tex]
[tex] {y}^{2} = 7 \times 7 = 49[/tex]
[tex]y = 7[/tex]
[tex]x = \frac{5}{7} y = \frac{5}{7} \times 7 = 5 [/tex]
