Team A performed 21 shows.
Team B performed 5 shows.
A = 4B + 1
B = A - 16
Substitute 4b + 1 for a in b = a − 16:
b = a − 16
b = 4b + 1 − 16
b= 4b − 15 (Simplify both sides of the equation)
b − 4b = 4b − 15 − 4b (Subtract 4b from both sides)
−3b = −15
−3b/−3 = −15/−3(Divide both sides by -3)
b=5
Substitute 5 for b in a = 4b + 1:
a = 4b + 1
a = (4)(5) + 1
a = 21
