Answer:
x = 7.5
Step-by-step explanation:
y is directly proportional to x
Formula:
y=k x (k represent as the proportion)
Substitute to given detail
When y=-20, x=5.
•At this point you need to solve k for the proportion.
-20=k(5)
5k=-20
k=-4 (Must be shown, youll be awarded mark(s) )
•Use k=-4 to complete the second equation.
When y= -30,
-30= (-4)x
-4x= 30
x= -(30/4)
x=-7.5
-7.5 Is the final answer
