OpenStax, Algebra and Trigonometry 2e §11.1 Systems of Linear Equations: Two Variables · Exercise 66 · Algebra · Systems
Systems of Linear Equations: Two Variables · Exercise 66
Use a system of linear equations with two variables and two equations to solve.
A number is 9 more than another number. Twice the sum of the two numbers is 10. Find the two numbers.
Its source prints no answer for this problem, so there's nothing to check against.
OpenStax, Algebra and Trigonometry 2e · §11.1 Systems of Linear Equations: Two Variables · Exercise 66
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