Y=(1/2)x cause the constant variation is 1/2
Answer:

Step-by-step explanation:
Given

Required
Find a
Take log of both sides

Apply law of logarithm

Divide both sides by a

Multiply both sides by -9

Apply law of logarithm

Cancel out log

Rewrite as:

Apply law of indices


The answer is a I hope this helped you out
Answer:
27 girls
Step-by-step explanation:
boys 2 : 3 girls
18: x
18×3= 54:2x
54÷2= 27