Question

Diketahui (×, y) memenuhi sistem persamaan {2× - y = 10 } , {3× - 2y =16 } Nilai 4× - y =........

Answer 1

2x - y = 10 --> y = 2x - 10
3x - 2y = 16 --> 3x - 2(2x-10) = 16
3x - 4x + 20 = 16
-x = - 4
x = 4
y = 2x - 10 --> y = 2(4) - 10= 8 - 10 
y = - 2

nilai 4x -y = 4(4) - (-2) = 16 + 2 = 18