You can write two equations in the two unknowns. Let s and e represent the numbers of Standard and Enhanced units sold, respectively. Then the problem statement tells you .. s + e = 19 . . . . . . . . . . . . . . . Lindsay sold a total of 19 units .. 210s +265e = 4485 . . . . . . Lindsay took in $4,485
Since you want to know s, you can use the first equation to write an expression for e in terms of s. .. e = 19 -s Substitute this into the second equation. .. 210s +265(19 -s) = 4485 .. -55s + 5035 = 4485 . . . . . . eliminate parentheses .. -55s = -550 . . . . . . . . . . . . . subtract 5035 .. s = 10 . . . . . . . . . . . . . . . . . . . divide by the coefficient of s