Question

what are the condition for two quantities to be in direct proportion?

Answer 1

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If the ratio (yx) of two variables (x and y) is equal to a constant (k = yx), then the variable in the numerator of the ratio (y) is the product of the other variable and the constant (y = k⋅x). In this case y is said to be directly proportional to x with proportionality constant k

Answer 2

Step-by-step explanation:

Two quantities are said to be in direct proportion in change in one quantity produces similar change in the other quantity!!

the change here means either increase or decrease...

that is if a varies as b

then,a=kb

where k=constant of proportionality....

for example:

a is in direct proportion to b....

then,if a doubles then b also doubles....

a quantity may be directly proportional to square or nth power of second quantity where n is positive fraction....