5x+6y=-20
9y+2x=25
x=-4.5y+12.5
5*(-4.5y+12.5)+6y=-20
-22.5y+62.5+6y+20=0
-16.5y+82.5=0
y=82.5/16.5
y=59y+2x=25
9*5+2x=25
45+2x-25=0
20+2x=0
x=-20/2
x=-10
5x+6y=-20
9y+2x=25
9y+2x=25
x=-4.5y+12.5
5x+6y=-20
5*(-4.5y+12.5)+6y=-20
-22.5y+62.5+6y+20=0
-16.5y+82.5=0
y=82.5/16.5
y=5
9y+2x=25
9*5+2x=25
45+2x-25=0
20+2x=0
x=-20/2
x=-10