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The line y=0.15x+0.79 represents an estimate of the average cost of gasoline for each year.

The line 0.11x-y=-0.85
estimates the price of gasoline in January of each year (Bureau of Labor Statistics, 2006).

a)Do you expect the lines to be intersecting, parallel, or perpendicular? Explain your reasoning.

No they are not perpendicular? the result does not equal -1?

b)Use the equations of the lines to determine if they are parallel. What did you find?

they are not parrallel

c)Did your answer to part b confirm your expectation in part a?

a) they intersect. Notice the slopes are not equal, and they are not the negative reciprocal.

what is the best answer or way to write C...?

If the lines intersect, they cannot be parallel, by definition.

Yes, my answer to part b confirms my expectation in part a. I expected the lines to be neither perpendicular nor parallel, and this is what I found when I determined that they are not parallel.