SOLUTION: If y varies directly as x and y=4 when x=-2, find y when x=30.

SOLUTION: If y varies directly as x and y=4 when x=-2, find y when x=30.

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Question 42100: If y varies directly as x and y=4 when x=-2, find y when x=30.
Answer by venugopalramana(3286) (Show Source): You can put this solution on YOUR website!
If y varies directly as x
THAT IS
Y=KX..WHERE K IS A CONSTANT.
and y=4 when x=-2,
4=-2K.....K=-2
Y=-2X
find y when x=30.
Y=-2*30=-60
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