16shuston one year ago Will medal and fan. If x varies directly as y, and x=42 when y=7, find x when y=3

1. 16shuston

all i need is the set up

2. Nnesha

equation for direct variation $\huge\rm y=kx$ where k is constant of variation.

3. Nnesha

substitute x and y for their values solve for k

4. anonymous

Ok so you are going to do this: 42/7 = x/3 Now cross multiply 42*3 = 7x Solve for x

5. 16shuston

okay that makes sense. thank you

6. anonymous

126 = 7x x = 18 Medal? Please

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