A few days ago
Anonymous

HELP! The variables x and y vary directly. Write an equation that relates x and y. Then find x when y = -4.?

1. x = -6, y =8

2. x = -12, y = 84

THANKS!

Top 1 Answers
A few days ago
Maverick

Favorite Answer

to vary directly, they must be in the format y = kx where k is a constant value

so

8 = -6k

divide both sides by -6

-(4/3) = k

y = -(4/3)x

-4 = -(4/3)x

3 = x

2. 84 = -12k

divide by -12

k = -7

y = -7x

-4 = -7x

x = 4/7

hope this helps

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