#### Answer

a. The solution of the proportion is y=1.8.
b. Using the Cross Product Property would be a lot easier to use when solving 3/5=13/b.

#### Work Step by Step

a. The equation for this question is 5y=9. To isolate y, you would divide 5 from both the sides to get y=1.8.
b. The Cross Product Property helps find the answer for proportion questions a lot more easily than any other type. When you use Cross Product Property all you do is multiply diagonal which would be 3b=65 and all you do is solve it like a normal equation. The answer would be b = 21.67.