Explanation: Tickets (t) = $8 Popcorn & Soda (s)= $5 Friends = 4 Since all friends bought the same thing the equation will be set as 4(t +s) = m OR 4t +4s = m Using substitution, you plug each variable t = 8 and s = 5 4((8) + (5)) = m 4(8+5) = m => 4(13) =m => 52=m OR 4(8) + 4(5) = m => 32 + 20 = m => 52 =m