## Algebra: A Combined Approach (4th Edition)

Expression: -7x, Reciprocal: $-\frac{1}{7x}$
The opposite of a number is one in which their sum equals 0. -7x + 7x = 0 An expression's reciprocal is a number in which their product equals 1. -7x ($-\frac{1}{7x}$) = 1