Question

Hots
82 berdua.
matematika smp. ​

Answer 1

misal:

x = benar

y = salah

z = tidak dijawab = 10

*)persamaan 1:

x+y+z = 50

x+y+10 = 50

x+y = 50-10

x+y = 40

*)persamaan 2:

4x-2y-z = 120

4x-2y-10 = 120

4x-2y = 120+10

4x-2y = 130

2x-y = 65

*) eliminasi:

x+y = 40

2x-y = 65

----------------- +

3x = 105

x = 35 (C)