Everyone would get 0.66666666666666666 and so on
For direct variation:
y = kx
9 = 12k
k = 9/12 = 3/4
Answer:
.
Step-by-step explanation:
Expand the left-hand side of this equation:
.
Collect the terms, so that this quadratic equation is in the form
:
.
.
In this equation:
Calculate the quadratic discriminant of this quadratic equation:
.
A quadratic equation has no real root if its quadratic discriminant is less then zero. As a result, this quadratic equation will have no real root when
. Solve for the range of
:
.