In quadrilateral abcd, diagonals ac and bd bisect one another:
what statement is used to prove that quadrilateral abcd is a parallelogram?
angles abc and bcd are congruent.
sides ab and bc are congruent.
triangles bpa and dpc are congruent.
triangles bcp and cdp are congruent.

step-by-step explanation:

it's 15

the slope of the line is 60

one point on the line is (40,10)

step-by-step explanation:

in the equation outside the parenthesis the equation always tells you the slope. in this case it is 60.

in the parenthesis is also says 40 which is x because it is near the x and 10 is y because it is near y.