Question

Diketahui persamaan linear 7x + 2y = 19 dan 4x - 3y = 15,nilai 3x -2y adalah...

Answer 1

7x + 2y = 19 | x3 | 21x + 6y = 57
4x - 3y = 15 | x2 | 8x - 6y = 30
------------------ +
29x = 87
x = 3
7x + 2y = 19
7(3) + 2y = 19
21 + 2y = 19
2y = 19 -21
2y =-2
y = -1

3x - 2y
3(3) - 2(-1)
9 + 2
= 11
semoga membantu:)