Answer:
7.07106781187
Step-by-step explanation:
if its just asking 
:D
If he took x trips last year
3x+1=7
3x=6
x=2
he took 2 trips last year
The equation would be:
3.50 + 0.15x
x represents each 'late day'
Answer:
y = -3/2x + 6
Step-by-step explanation:
We won't be able to figure out Y in number form, since we have a second variable, but we can figure it out in terms of X.
First, we have to subtract 6x from both sides
( -4y = -6x + 24 )
Then we have to divide both sides by -4
( y = -3/2x + 6 )
This is our final answer in terms of x