Question

A railroad crew can lay 6 miles of track each day. They need ti lay 174 miles of track. The length, L (in miles), that is left to lay after d days is given by the function.
L(d)=174-6d

(A) How many miles if track does the crew have left to lay after 17 days?
___ miles

(B) How many days it will take the crew to lay all the track?
___ days​

Answer 1

X + y = 13
- x + y = 3