Question

Identify the slope and y-intercept of 3/5 - 1/3 x

Answer 1

Your 3/5 - (1/3)x is an expression, not an equation.  You must write out the entire equation in question:

"Identify the slope and y-int. of y = 3/5 - (1/3)x."

The y-intercept is obvious:  It's 3/5.

The slope is (1/3).