bonjour, peut on m aider a developper ces deux systèmes 8x+5y-4=0 et 2x-7y+10=0

8x+5y-4=02x-7y+10=0

8x + 5y = 4
2x -7y = -10

8x + 5y = 4
-8x +28y =40
0x + 33y=44
y= 44/33
y= 4/3

8x + 5(4/3) =4
8x + 20/3 = 4
8x X3 + 20 = 4X3
24x + 20 = 12
24x= 12-20
24x= -8
x= -8/24
x=-1/3