Question

Answer 1

a)vì x tỉ lệ thuận nên :y=kx

\(\Rightarrow6=k3\)

\(\Rightarrow k=\dfrac{6}{3}=2\rightarrow y=2x\)

b)y=2x

*khi x=-1\(\Rightarrow y=2.\left(-1\right)=-2\)

*khi x=24\(\Rightarrow y=2.24=48\)

c)\(y=2x\Rightarrow x=\dfrac{1}{2}y\)

*khi y=4\(\Rightarrow x=\dfrac{1}{2}.4=2\)

*khi y=12\(\Rightarrow x=\dfrac{1}{2}.12=6\)