Direct Variations

A relationship between two quantities, x and y, where, as x increases y also increases or as y decreases, x also decreases and the ratio between them is constant or the same for all given values of the variables.

• Direct Variation

• Inverse Variation

There is a direct variation whenever a situation produces pairs of numbers in which their ratio is constant.

• True

• False

Which describes mathematical equation or formula in this statement,

' h varies directly as j ' ?

• k=hj

• h=kj

• h=k/j

• k=h/j

Find which statement is correct in this formula or equation.

" w = ka "

• w varies directly as a

• w is inversely as a

• w is directly proportional to a

• w varies jointly as a

What is the meaning of 'K' in w=ka?

• constant of proportionality

• constant of integer

• constant of division

• constant of variation

An employee's salary s varies directly as the number of days d he has worked. Which statement is correct?

• k=sd

• s=kd

• k=s/d

• s=k/d

If x and y vary directly, as x increases the value of y increases as well.

• True

• False

y varies directly with x. If y=20 when x=4, what is y when x=-2?

• -10

• 10

• -5

• 5

Direct variation occurs whenever a situation produces pairs of numbers whose product is constant.

• True

• False

A relationship between two quantities in which a change in one quantity produces a change in another quantity.

• Equation

• Integer

• Variation

• Addition