Question

Answer 1

Ta có:

\(\dfrac{y_1}{x_1}=\dfrac{-4,5}{-3}=\dfrac{3}{2}\)

\(\dfrac{y_2}{x_2}=\dfrac{-3}{-2}=\dfrac{3}{2}\)

\(\dfrac{y_3}{x_3}=\dfrac{0,75}{0,5}=\dfrac{3}{2}\)

\(\dfrac{y_4}{x_4}=\dfrac{1,5}{1}=\dfrac{3}{2}\)

\(\dfrac{y_5}{x_5}=\dfrac{6}{4}=\dfrac{3}{2}\)

\(\Rightarrow\dfrac{y_1}{x_1}=\dfrac{y_2}{x_2}=\dfrac{y_3}{x_3}=\dfrac{y_4}{x_4}=\dfrac{y_5}{x_5}=\dfrac{3}{2}\)

Vậy x và y là hai đại lượng tỉ lệ thuận ta có:

\(\dfrac{y}{x}=\dfrac{3}{2}\Rightarrow y=\dfrac{3}{2}x\)