Whatcha statements describes the graph of the system of equations {x-y=1
{y-x=1

A. lines are parallel.
B. the lines are coinciding.
C. the lines intersect at (1,0)
D. The lines intersect at (-1,0)

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?

An arithmetic series a consists of consecutive integers that are multiples of 4 what is the sum of the first 9 terms of this sequence if the first term is 0