m and n are the x and y coordinates, respectively, of a point in the coordinate plane. If the points (m, n) and (m + p, n + 9) both lie on the line defined by the equation x = (y/3) - (2/5), what is the value of p?  Options.
A) 1 B) 2 C) 3 D) 4 E) 5
x = (y/3) - (2/5), and so y = 3x + 6/5. The slope is 3.   (n+9-n) / (m+p-m) = 3   p = 3   The answer is 3.
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m and n are the x and y coordinates, respectively, of a point in the coordinate plane. If the points (m, n) and (m + p, n + 9) both lie on the line defined by the equation x = (y/3) - (2/5), what is the value of p?