(2x-9y=23) (2) Multiply by 2 -4x-4(-3)=20. Put -3 where "x" belongs Y= -3, x= -2
-4x-4y=20. -4x+12=20.
+4x-18y=46. Add -12 -12. Subtract 12 on both sides
__________. __________
-22y=66. -4x=8
_______. _____
-22 -22. Divide by -22 -4. -4. Divide by -4
________. = x=-2
Y= -3