The variable y varies inversely as x : y is 1 2/3 when x is -3/5. Find y when x is 3/7

Answer 1

y = k(1/x)
xy = k
when x = -3/5, y = 5/3
(-3/5)(5/3) = k
k = -1

so y = -1/x
xy = -1

if x = 3/7
(3/7)y = -1
y = -7/3

check: (3/7)(-7/3) = -1