Answer:
[tex]b=(3/4)a[/tex]
Step-by-step explanation:
we know that
A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form [tex]y/x=k[/tex] or [tex]y=kx[/tex]
In this problem the variables are a and b
so
[tex]b/a=k[/tex]
Find the value of k
For a=-4, b=-3
substitute
[tex]k=-3/-4=3/4[/tex]
The equation is equal to
[tex]b=(3/4)a[/tex]