How do you evaluate the expression #8+6r# given r=7?

1 Answer
EZ as pi
Jul 2, 2016

Substitute 7 for the #r# and calculate the value of the expression to be 50.

Explanation:

The word evaluate means "find the value of".

In algebra, the variables represent numbers and when we know what that value is, we can replace the variable by a number and calculate a value for the expression.

#8 + 6r# means # 8 + 6 xx r#

# = 8 + 6 xx (7)#

#= 8 + 42 = 50#

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