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Ainat [17]
3 years ago
7

The owner of a bike shop sells unicycles and bicycles and keeps inventory by counting seats and wheels. One day, she counts 21 s

eats 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 1.

A. u=-b+21
B. -u=b+21
C. 21/6=u
D. b+u=21
E. b=u+21
Mathematics
1 answer:
katrin [286]3 years ago
3 0
Unicycle has 1 seat and 1 wheel.
Bicycle has 1 seat and 2 wheels.
u + b = 21
u + 2 b = 30   ⇒ u = 30 - 2 b
--------------------------------------
30 - 2 b + b = 21
30 - b = 21
b = 9,  u = 30 - 18 = 12
There are 12 unicycles and 9 bicycles.
An equation in slope-intercept form:
u + b = 21
u = - b + 21
Answer: A ) u = - b + 21
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