The expression -7y is a

Term

Constant

Variable

in -7y y is variable and -7 is Constant

Step-by-step explanation:

Constant: A number that cannot change its value. In the expression 2x+4y−9 , the term 9 is a constant. Like Terms: Terms that contain the same variables such as 2m , 6m or 3xy and 7xy

variable is a symbol which functions as a placeholder for varying expression or quantities, and is often used to represent an arbitrary element of a set.

b. ol

step-by-step explanation:

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congruent: (geometry) (of figures) identical in form; coinciding exactly when superimposed.