Dollars is the dependent quantity because the amount you pay depends on how many gallons you've pumped.
The graph of the line y = -6 is a horizontal line which passes through the y axis at -6. On the other hand, the graph of the equation, x = 1/6 is a vertical line that passes through the x-axis at 1/6. The intersection of these lines is at a point that is expressed as (1/6, -6).
Is there any more information?
(x-21)/4
x is the number subtract 21 and divide by 4
18/35 is halfway between 3/5 and 5/7. Do you want me to explain or just the answer?
