Identify the variation as direct, inverse, joint or combined. y = 7x

y =7x , follows the direct variation.

Step-by-step explanation:

Direct variation states that a relationship between two variables in which one is a constant multiple of the other. In other words,  when one variable changes the other changes in proportion to the first.

If y is directly proportional to x i.e, or

y = kx              .....[1]  where k is the constant variation

Given : y = 7x

On comparing this with equation [1] we get;

k(constant of variation) = 7

therefore,

it follows the direct variation as  or

y = 7x where k =7 is the constant of variation.

Therefore, y =7x follows the direct variation.

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step-by-step explanation:

b and c

step-by-step explanation: