1) 8x-y=9
8x+14y=-6
-15y=15
y=-1
8x+1=9
8x=8
x=1
(1;-1)
2) 9x-27y=-90
9x+7y=80
-34y=-170
y=5
9x-27*5=-90
9x=-90+135
9x=45
x=5
(5;5)
1) 8x-y=9
8x+14y=-6
-15y=15
y=-1
8x+1=9
8x=8
x=1
(1;-1)
2) 9x-27y=-90
9x+7y=80
-34y=-170
y=5
9x-27*5=-90
9x=-90+135
9x=45
x=5
(5;5)