Ta có : \(\frac{-36}{84}=\frac{-36:12}{84:12}=\frac{-3}{7}\)
+) \(\frac{3}{x}=\frac{-3}{7}\)
=> \(x=\frac{3\cdot7}{-3}=-7\)
Vậy x = -7
+) \(\frac{y}{35}=\frac{-3}{7}\)
=> \(7y=35\cdot\left(-3\right)=-105\)
=> \(y=\left(-105\right):7=-15\)
Vậy y = -15