Simple question:

Is this a direct variation?

Age x.... 10, 11, 12, 13
Grade y.... 5, 6, 7, 8

(that's supposed to be a table)

I do not think it is... that's correct, right? You don't get the same thing when you divide 10 and 5 and when you divide 13 and 8

Question

Simple question:

Is this a direct variation?

Age x.... 10, 11, 12, 13
Grade y.... 5, 6, 7, 8

(that's supposed to be a table)

I do not think it is... that's correct, right? You don't get the same thing when you divide 10 and 5 and when you divide 13 and 8

opcode · Answer

Since both the x and y values increase, then this is direct variation. 
Direct variation is written as:
$$y = kx$$
Where k is the constant of variation.
$$5 = k(10)$$
$$k = \frac{1}{2}$$

$$y = \dfrac{1}{2}x$$

What's the issue?

campbell_st · Answer

nope... for direct variation... you need

y = kx

each value of x is multiplied by the same value...

campbell_st · Answer

if it was direct variation the grade values would be 

1/2 x 10 = 5

1/2 x 11 = 5.5

1/2 x 12 =6

etc