Sally bought 3 hamburgers and 2 drinks for $10.45. Jason bought 4 hamburgers and 3 drinks for $14.30. How much would 1 hamburger and 1 drink cost altogether?

Answer 1

3H +2D = 1045

4H+3D = 1430

multiply 1st by 3 and 2nd by 2 then subtract to eliminate one variable

9H+6D = 3135

8H +6D = 2860

H = 275 $2.75 for a hamburger

2D = 1045-3(275) = 1045- 825 = 220 or $2.20 for a drink

altogether one burger & drink cost 2.2+2.75 = $4.95