Abel bought 3 similar shirts and 4 similar jackets for $360
Marcus bought 1 such shirt and 3 sucj jackets for $220
What is the cost of each shirt?
3s + 4j = 360
s + 3j = 220 ----> s = 220 - 3j
using substitution,
3(220 - 3j) + 4j = 360
660 - 9j + 4j = 360
-5j = - 300
j = 60
sub back into s = 220 - 3j
s = 220 - 180 = 40
state your conclusion