y= -9x-4
y= -9*(-2)-4= 18-4= 14
y=2x-9
-6=2x-9
3=2x
x= 1,5
y=0
2x-3=0
x= 3/2
(3/2;0)
-2x+7=0
x= 7/2
(7/2;0)