What does 9/10 times a number plus 6 is 51 mean?

Geometry answer picture question pls . reason and statements

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

Solving systems of linear equations: tables represent two linear functions in a systemöwhat is the solution to this system? 0 (10)0 (1.6)0 18,26)0 18-22)