Yes. Any change in 'x' produces exactly double that amount of change in 'y'.
Yes, it is direct variation.
The question is not clear. But if you want this in the form y=kx, then k must be 1.5
50
2
The equation is xy = 5*9 = 45 Alternatively, y = 45/x
Yes, it is direct variation.
No, it is not a direct variation.
No.
y=7x
1
No, this is an inverse variation.
Direct
No.
No, it does not.
Yes
Y varies in direct proportion to x.
y = 5x + 1 is nota direct variation.y = 5x + 1 is nota direct variation.y = 5x + 1 is nota direct variation.y = 5x + 1 is nota direct variation.