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Type the correct answer in each box. Use numerals instead of words. If necessary, use / for the fraction bar(s). A square is graphed in an x y plane, where x axis ranges from negative 5 to 4 in increments of 1 and y axis ranges from negative 2 to 4 in increments of 1. The vertices are at (0, 0), P (negative 2, 2), (0, 4), and Q (2, 2). A line runs from P to Q. The slope of diagonal PQ is____ , and its equation is ____