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Write a direct variation equation that relates x and y. Assume that y varies directly as x. Then solve. If y = 2 when x = –4, find x when y = 20. a. y = x; c. y = x; b. y = x; d. y = x;
y varies directly as x, the equation is y = kx y = 2 when x = –4, k = y/x = 2/-4 = -1/2 The equation is y = -1/2x When y = 20, -1/2x = 20, x = 20(-2) = -40
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Asked 4/18/2014 7:57:02 AM
Updated 4/18/2014 9:00:27 AM
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y varies directly as x, the equation is y = kx
y = 2 when x = –4, k = y/x = 2/-4 = -1/2
The equation is y = -1/2x
When y = 20, -1/2x = 20,
x = 20(-2) = -40
Added 4/18/2014 9:00:27 AM
This answer has been confirmed as correct and helpful.
Confirmed by andrewpallarca [4/18/2014 9:04:52 AM]
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If y = –54 when x = –9, find y when x = 6. a. y = –6x; –36 c. y = 6x; 42 b. y = 5x; 36 d. y = 6x; 36
Weegy: x=-1 and x=-1/5 for the equation 5x^2+6x=-1 (More)
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Expert Answered
Updated 4/18/2014 9:03:12 AM
1 Answer/Comment
If you mean y varies directly as x, then y = kx
y = –54 when x = –9,
so k = y/x = -54/-9 = 6
The equation is y = 6x
when x = 6, y = 6(6) = 36
Added 4/18/2014 9:03:12 AM
This answer has been confirmed as correct and helpful.
Confirmed by andrewpallarca [4/18/2014 9:04:44 AM]
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