With reference to figure, see which quadrants or axes do the points L, M, N, K, G, B, R, T and D belong, and find the sum of the abscissa of all the marked points.
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Solution
Concept: for any point P(m,n), m is called abscissa and n is called ordinate.
Point
Position
L(3, 2)
I quadrant
M(-3, 1)
II quadrant
N(-4, -2)
III quadrant
K(4, 0)
X-axis
G(-1, 0)
X-axis
B(0, 3)
Y-axis
R(2, -1)
IV quadrant
T(5, -2)
IV quadrant
D(0, -2)
Y-axis
sum of abscissa of all points =3+(−3)+(−4)+(−1)+0+2+5+0=3−3−4−1+2+5=2