The owner of a bike shop sells unicycles and bicycles and keeps inventory by

counting seats and wheels.? One day, she counts 21 seats and 30 wheels. How many of each type of cycle are there?

Choose an equation in slope-intercept form that expresses the fact the number of bicycles plus the number of unicycles is 21.
A. 21/b = u
B. b + u = 21
C. u = -b + 21
D. b = u + 21
E. -u = b + 21