Question

Amy sold pens and pencils for a fundraiser at school. Pencils sold for $1.50 and pens sold for $2. She sold a total of 35 items and made $61.50. How many pens did Amy sell?

Answer 1

x + y = 35
1.50x + 2y = 61.50

Answer 2

y = 35 - x
y = (61.50 - 1.50x)/2


y = y
2(35 - x) = 61.50 - 1.50x
70 - 2x = 61.50 - 1.50x
70 - 61.50 = 2x - 1.50x
8.50 = .50x
8.50/.50 = x
17 = x
18 = y