If j and k are nonzero integers, which pair of points must lie in the same quadrant?
answer choices (please post these next time) (j, j) and (k, k) (j, k) and (jk, jk) (j + k, 3) and (3, j + k) (3j, 3k) and (3/j, 3k)
now, this requires a bit of trial and error, but the main idea: if two points lie in the same quadrant, their x-coordinates must have the same sign, and their y-coordinates must have the same sign ex: (+, -) and (+, -) or (-, +) and (-,+), etc. an easier way to approach this is to try to find some j and k combination that will *not* be in the same quadrant, to eliminate answer choices for example, starting with (j, j) and (k, k), if we let j = 1 and k = -1 then the points are (1,1) and (-1,-1) which are clearly not in the same quadrant, so it can't be choice 1. repeat this logic for the rest of the answer choices.
alternative way of thinking: think about which operations can/can't/must change the sign of a number
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