What do equations and expressions have in common

An equation is a statement (a sentence) that says that two expressions (phrases) are equal ( are the same ) —even if they look different. The expression 4 and the expression 1+3 look different, but they represent the same thing. An expression is a meaningful collection of constants, variables, and/or operations.

Step-by-step explanation:

table 3 represents a direct variation function. : )