## Prealgebra (7th Edition)

We can see if 9 is a solution of 5n-6=40 by substituting 9 into the equation as n. If the equation holds true, then 9 is a solution. If the equation is false, 9 is not a solution. 5n-6=40 5(9)-6=40 45-6=40 39$\ne$40 9 is not a solution