Comparing two affine taxi fares

Taxi company ABC charges a \(\$4.00\) flag-down fare plus \(\$0.30\) per \(0.5\) km.

1. Find the fare for \(9.5\) km.
2. Find the distance for a \(\$16\) fare.
3. Write a formula connecting fare \(y\) and distance \(d\).
4. Company PQR uses the supplied graph. Explain whether its \(y\) is directly proportional to \(d\).
5. Which company is cheaper for \(3\) km? Justify.
6. What is the maximum distance for which that chosen company is no more expensive?