Question

the variables x and y vary directly. write an equation that relates x and y. then find x when y=-4.

x=-20/3, y=-15/8

Answer 1

the variables x and y vary directly

means that

y = kx

Answer 2

y = kx

-20/3 = k*(-15/8) ... Plug in x=-20/3, y=-15/8

Now solve for k

Answer 3

32/9?

Answer 4

good

Answer 5

y = kx

y = (32/9)*x

Now plug in y = -4 and solve for x

-4 = (32/9)*x

keep going to solve for x

Answer 6

-8/9?

Answer 7

close, but no

Answer 8

double check your work

Answer 9

i still got the same answer..

Answer 10

-4 = (32/9)*x

-4*9 = 32x

-36 = 32x

did you get this far?

Answer 11

yep. -9/8?

Answer 12

good, -9/8 is the answer