Suppose that X and Y vary inversely. If y= - 4 when x=20, find y when x= 10.
How do you solve this problem?

if x=20 when y=-4, find y when x=10

if x=5 when y=-1/3,find y when x=10

if x=2.5 when y=100, find x when y=50

if x=-4/15 when y=-105, find x when y=4

it has to have an angle of 90 degrees

i believe that the answer is y+6=1/3(x+2)