a)
p = # of fruit pies sold
b = # of fruit juice bottles sold
p + b = 79 --------> p = 79 - b
1.65p + 1.36b = 118.17
Substitute p = 79 - b into 1.65p + 1.36b = 118.17
1.65(79 - b) + 1.36b = 118.17
130.35 - 1.65b + 1.36b = 118.17
130.35 - 0.29b = 118.17
- 0.29b = -130.25 + 118.17
- 0.29b = - 12.18
b = 42
p = 79 - 42
p = 37
37 fruit pies sold
42 fruit juice bottles sold
b)
Mr. Sanchez's class sold: 1.65p = 1.65 (37) = $61.05
Mr. Kelly's class sold: 1.36b = 1.36(42) = $57.12
Mr. Sanchez's class earned more money
C) $61.05 - $57.12 = $3.93
Mr. Sanchez's class earned $3.93 more than Mr. Kelly's class
