s=sweaters, p=pants
a) 35s + 20p =$150
b) 35*3 + 20p =$150
105 + 20p =$150 subtract 105 from both sides
20p =150 - 105
20p =45 divide both sides by 20
p =45/20
p=2.25 =2 pants that she can buy.
c) 35s + 0p = $150
35s = $150 divide both sides by 35
s =150/35
s=4 2/7 = 4 sweaters that she can buy.
