How do I find the variation constant and an equation of variation where y varies directly as x and y =70 when x=7

Answer 1

y=kx looks like k is y/x

Answer 2

http://www.purplemath.com/modules/variatn.htm
See the site above.
I would do
y=kx
y=70
x=7
Therefore, k = 70/7=10 and
the equation is y=10x