<PRE><B>Question 346275</B>
Solve b = 7 + 3c for c as step one.

b = 7 + 3c

b - 7 = 3c

(b - 7)/3 = c

Replace c with (b - 7)/3 in equation a.


a = 9c^2 + 4

a = 9[(b - 7)/3]^2 + 4

Do the math and solve for a.

This will give you the answer a in terms of b.

Understand?</PRE>