parallel lines have, the same exact slope, we know AB || CD, and if AB has a slope of -3/5, so CD's slope is the same.
It rounds up....this is basic math if the # ends 5+ it rounds up if it ends 4 or less it stays the stays the same
To solve for x^2 - 40 = 9, take the square roots of both sides and solve.
The answer is x = 7, -7.
