the value of y varies directly as x, y is 9 when x is -3 what is the constant of variation k

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sipstea sipstea

04-05-2017
Mathematics

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the value of y varies directly as x, y is 9 when x is -3 what is the constant of variation k

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irspow irspow · Answer 1 · 2017-05-04T22:00:52+02:00

irspow irspow

04-05-2017

direct variation has the form y=kx. Given a point we can solve for the constant k.

y=kx, when y=9 and x=-3 becomes:

9=-3k

k=-3 so the constant of variation is negative 3

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