Using algebra 3b+5d=34 2b+6d=36 This is a simultaneous equation Times top equation by two and bottom by 3 6b+10d=68 6b+18d=108 Subtract bottom equation by top one -8d=-40 d=5 substitute this into an equation 3b+25=34 -25 from both sides 3b=9 b=3 drink is $5 burger is $3
