Please help it’s for a test I need help

If the slope of one line equals the slope of another line then ? a) the two lines are intersecting lines b) the two lines are perpendicular lines c) the two lines are parallel lines d) the two lines always have very steep slopes

How do you solving the solution of each system using elimination?

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?