How do you evaluate the expression when y=3 and x=27 for #x-6y#? Algebra Expressions, Equations, and Functions Variable Expressions 1 Answer 1cabbage · EZ as pi Nov 17, 2016 #9# Explanation: To evaluate, substitute the #x# and #y# in the question with the numbers. In the expression, #x# is equivalent to 27, and #6y# is equivalent to #6xxy#, which is #6xx3=18# So, #x-6y# #=27-6xx3# #=27-18# #=9# Answer link Related questions How do you write the variable expression for: a quotient of 2 and the sum of a number and 3 ? What are variables? What are variable expressions? How do you write variable expressions? How do you evaluate variable expressions? How do you simplify the expression #3x-x+4#? How do you write a quotient of a number and 6 as an expression? How do you evaluate the expression #2x+1# for #x=1#? How do you write a product of a number and 2 as an expression? How do you write 5 less than 2 times a number as a variable expression? See all questions in Variable Expressions Impact of this question 1644 views around the world You can reuse this answer Creative Commons License