Respuesta :

y=21 because 3/21=7 and 7*3=21 so Y=21 
naǫ
Direct variation:
[tex]y=kx[/tex]

y=49 when x=7.
[tex]49=7k \\ k=\frac{49}{7} \\ k=7[/tex]

y=? when x=3.
[tex]y=7 \times 3 \\ y=21[/tex]

y=21 when x=3.