I need to translate this expression into an equation.
The product P of a number y and one and a half times that number.
Let us try to rewrite what you already have into mathematical terms.
The product P = a number y and one and a half times that number.
The product P = a number y and 1 1/2 times that number.
The product P = y and 1 1/2 times y.
The product P = y and 1 1/2 * y.
The product P = y and (3/2)*y
Now, here the product means multiply, so
The product P = y * (3/2)*y
The product P = (3/2)*y*y = (3/2)*y^2
Answer: P = 3y^2/2