Answer
Price of 1 sweater = $15.9
Price of 1 shirt = $7.8
Step-by-step explanation
Let the price of a sweater be x
Let the price of a shirt be y
one sweater and 4 shirts cost $47
x + 4y = 47 (eqn 1)
4 sweaters and 3 shirts cost $87
4x + 3y = 87 (eqn 2)
So, this gives us a simultaneous equation
x + 4y = 47
4x + 3y = 87
which on solving gives
x = (207/13) = 15.9
y = (101/13) = 7.8
Hope this Helps!!!