1. y = -1/2 + 2.
2. y= 2/5x - 4/5
Answer:
The groups walking speed is
or 
Step-by-step explanation:
we know that
To find the speed divide the distance by the time
so

Convert to mixed number

A) 42x-12
6*7=42. 6*2=12
b) 21y
11+4+6=21
I think the answer is b I havent done problems like that in like 2 years i hope i helped