Answer:
AB is parallel to BE because it is an equilateral triangle.
BE is parallel to EC because it has 2 of the same angles to the same sides are equal.
Hope that helps, it's a tad hard to explain
7.70 and 7.700 they are all the same since the 7 tenths are still in its place
Generally plug 0 in for x and solve for y. whatever y is is your y intercept