SOLUTION: z=2x+3y+7 x=z+2/2 y=-3z-7 find the solution of x,y and z

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Question 1038378: z=2x+3y+7
x=z+2/2
y=-3z-7
find the solution of x,y and z
Answer by addingup(3677) About Me  (Show Source):
You can put this solution on YOUR website!
Substitution method:
z=2x+3y+7
x=z+2/2 NOTE: Did you mean 2/2? 2 divided by 2 = 1, so the number is 1
y=-3z-7
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z=2(z+1)+3(-3z-7)
z=2z+2-9z-21
z=-7z-19
8z = -19
z = -19/8 = -2 3/8