Answer:
$47
Explanation:
Create a system of equations where s is the cost of a shirt and t is the cost of a tie:
s + t = 64
s = t + 30
Solve by substitution by substituting (t + 30) into the first equation as s:
s + t = 64
(t + 30) + t = 64
Add like terms and solve for t:
2t + 30 = 64
2t = 34
t = 17
Then, plug in 17 as t into one of the equations to find s:
s = t + 30
s = 17 + 30
s = 47
So, the cost of the shirt is $47