What is the sum of #9y^2 + 7y^2#? Algebra Expressions, Equations, and Functions Variable Expressions 1 Answer Satvik G. · Stefan V. Mar 10, 2018 Answer: #16y^2# Explanation: This is because since they both have the same variables, we are only focusing on the coefficients, #9# and #7#, which we need to add up in order to combine the two terms. Thus, we get #16y^2#. 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 286 views around the world You can reuse this answer Creative Commons License