Yand x have a proportional relationship, and y = 25 when x = 60.
what is the value of x when y = 30?

-25
-36
-50
-72

This equation can be solved by using y = kx.  

Since y = 25 when x = 60,

25 = 60k and if we solve for k then k= 5/12.

That means the equation we're using is

y = (5/12)x.

Plug in y = 30 and you get

30 = (5/12)x

Solve for x

30 * (12/5) = x

360/5 = x

x = 72

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