SOLUTION: I have an elimination question I hope some one could help me? x/2+2y=9 2x-y=18 thank you also if you have time could you help me with this graph Solve the following system

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Question 24437: I have an elimination question I hope some one could help me?
x/2+2y=9
2x-y=18
thank you
also if you have time could you help me with this graph
Solve the following systems of equations by graphing:
y=x^2-4 and y=x-2
this would be greatly appreciated.
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
1) Solve by elimination:
1) %28x%2F2%29%2B2y+=+9 Multiply this equation by 4 to get equation 1a)
2) 2x-y+=+18
1a) 2x%2B8y+=+36 Now subtract equation 2) from equation 1a)to eliminate x.
2x%2B8y+=+36
2x-y+=+18
----------------
9y+=+18 Divide both sides of the equation by 9.
y+=+2 Now substitute this value of y into either of the two original equations and solve for x. Take the second equation.
2x-y+=+18
2x-2+=+18 Add 2 to both sides.
2x+=+20 Divide both sides by 2.
x+=+10
The solution is: (10, 2)
Here's the graphical solution:
graph%28300%2C200%2C-2%2C12%2C-20%2C10%2C%28-x%2F4%29%2B%289%2F2%29%2C2x-18%29