87. 7824-!-item-!-187;#058&005664
XY向線上一PQR三角形
Q
l
l
P__________R
In the figure above, segments PQ and PR are each parallel to one of the rectangular coordinate axes. What is the sum of the coordinates of point P ?
(1) The x-coordinate of point Q is -1.
(2) The y-coordinate of point R is 1
ANS: C
這題時在是不懂在說啥?...有誰可以幫忙只較一下...tks