(5.6) Direct Variation

Is this a direct variation?
y=2x

Is this a direct variation?  y =2x + 1

Is this a direct variation?

Is this a direct variation?

What ordered pair does a direct variation always go through when graphed? Options: (0, 0), (1, 0), (0, 1), (1, 1)

Which of the given graphs is a direct variation? Options: A, B, C, D

Tell whether x and f(x) show a direct variation.

Determine if the relationship between the two quantities is a direct variation.

Determine if the relationship between the two quantities is a direct variation.

Determine if the relationship between the two quantities is a direct variation. Options: yes, the constant of variation is 1/2; yes, the constant of variation is 2; no, there is constant of variation.