Step-by-step explanation:
Okay, so let's represent the people as letters.
Erick= e
Tyson=t
Lane=l
They sold 90 tickets for the school banquet altogether. This means that e+t+l equals 90. Now since you know how much Erick and Tyson sold, this would mean you can replace your letters (variables) with numbers in your equation, like so:
e+t+l=90
38+24+l=90 (l remains a letter because we don't know how many he sold.)
Now add 38 and 24 to get 62.
62+l=90
To find l, we have to subtract 62 from 90.
62+l=90
-62 -62
--------------------
0+l= 28
l=28 The answer is 28.
