if 10x-10y=0, then 10x=10y, or x=y
plug that into the other equation to get
5x-4x = 8
x=8, so y=8
the others are basically the same. you can substitute, or eliminate.
-8x - 8y = -8
-5x + 16y = 16
x+y=1, so y = 1-x
-5x + 16(1-x) = 16
-21x = 0
x=0, so y=1
-8x + 8y = -16
-3x + 7y = 10
multiply top by 3 and bottom by -8 to get
-24x + 24y = -48
24x - 56y = -80
add them up to get
-32y = -128
y = 4, so x = 6
Try the others and come back if you get stuck. Show us whatcha got, and we can straighten it out if necessary.
If you get an answer, be sure to plug the values back into both original equations to make sure it is right.
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