Answer:
x = 16
Explanation:
given x is directly proportional to y, then the equation relating them is
x = ky ← k is the constant of proportionality
to find k , substitute x = - 12 when y = 3 into the equation
- 12 = 3k ( divide both sides by 3 )
- 4 = k
x = - 4y ← equation of proportion
when y = - 4 , then
x = - 4 × - 4 = 16