He drove 56 miles because if you divide 168 and 3 it equals 56.
To get y you can move the x's to one side, so 120y=500-35x
then you can isolate the y, y= 500/120-35x/120
:)
I know this one give me like 5 minutes
P(taking 2 socks of same cllour) = 1/15
, or 8.60
Just use the distance formula