Algebra and mathematics

Question

Nine times the sum of a number and nine is -90. What is the number?

A) Translate the statement above into an equation that you can solve to answer this question. The structure of your equation should match the layout of the statement exactly, so do not simplify your equation. Use x as your variable. Hint: Your equation should contain parentheses.

The equation is
Preview

B) Solve your equation in part (A) for
x
.
x.

x =

 

Answer 1

Thank you for posting your question!

The expression here would be

9(x + 9) = -90

Solving that for the value of x yields

x + 9 = -10

x = -19

so the number that meets this criteria is -19

I hope that helps! Feel free to reach out via message for a lesson if you have any additional questions beyond that! :)