Explicație pas cu pas:
a) A(4, a), B(1, b+2), C(-2, 3c+3), D(4, 4−3d) aparțin axei absciselor:
a = 0
b + 2 = 0 => b = -2
3c + 3 = 0 <=> 3(c + 1) = 0 => c + 1 = 0 => c = -1
4 - 3d = 0 <=> 3d = 4 => d = 4/3
b) A(2-a, 3), B(-b-2, 2), C(1-2c, 5), D(0,5+2d, -3) aparțin axei ordonatelor:
2 - a = 0 => a = 2
-b - 2 = 0 => b = -2
1 - 2c = 0 <=> 2c = 1 => c = 1/2
0,5 + 2d = 0 <=> 2d = -1/2 => d = -1/4