5.
x = -1
y = 3
Step-by-step explanation:
you'll want to cancel the y numbers
5.
-2x-9y=-25
-4x-9y=-23
multiply the bottom with -1 so that you have
positive or +9y
-2x-9y= -25
-1 times (-4x-9y= -23)
-2x-9y= -25
+4x+9y= +23
this equals
2x = -2
x = -1
put -1 where the x is in -2x-9y= -25 to get y
-2(-1) -9y = -25 =
+2 -9y = -25
-9y = -27
y = 3
6.
8x+ y= -16
-3x+ y= -5
multiply 8x+ y= -16 with +3 AND
multiply -3x+ y= -5 with -8
so you can cancel out the x's
+3 (8x+ y= -16)
-8 times (-3x+ y= -5)
8x+ y= -16
+3x -y= +5
equals
24x+ 3y= -48
-24x +8y= -40
11y = -88
y = -8
