PLEASE HELP ME FASTT!!
(80points)
WILL MARK THE BRAINLIESTTT:-)

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

A ) u = - b + 21

1. 9 unicycles, 21 bicycles

2. A

Step-by-step explanation:

For first question;

If wheels = 30 and seats 21

We know that bicycles has seats so the number of bicycles will be 21

However we know that both unicycle and bicycle had wings so;

30-21=9

Unicycles =9

Let unicycle be represented as U and Bicycles B

Therefore:

U + B= 21 [ according to what is given]

In intercept form denoting slope or point where the graph cuts the X or y axis ; we use b is the dependent variable and u as the independent variables hence;

B= -U + 21