9x - 5y=19 7x - 4y=15 x+y=.... pake cara sibtususi atau eleminasi

9x -5y =19 |x 4
7x -4y = 15 |x5
36x -20y = 76
35x-20y = 75 -
x = 1

7x-4y= 15
7(1)-4y =15
4y=-15+7
4y =-8
y =-2

x+y = 1+-2
=-1

Dit: 9x - 5y = 19
       7x - 4y = 15
       x + y =......
Jawab:
9x -5y =19 |x 4
7x -4y = 15 |x5
36x -20y = 76
35x-20y = 75 -
x = 1

7x-4y= 15
7(1)-4y =15
4y=-15+7
4y =-8
y =-2

x+y = 1+-2
=-1



semoga membantu:)