SOLUTION: Can someone please help me: I need to solve this system of equation by graphing. If the system is inconsistent or the equations are dependent, say so. Please show me all your work

Algebra ->  Linear-equations -> SOLUTION: Can someone please help me: I need to solve this system of equation by graphing. If the system is inconsistent or the equations are dependent, say so. Please show me all your work       Log On


   

Question 124482: Can someone please help me: I need to solve this system of equation by graphing. If the system is inconsistent or the equations are dependent, say so. Please show me all your work so I can see where I am going wrong on this problem.
x-2y=6
x+2y=2
I also need to solve each for y to put in graphing calculator and can't figure it out.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
solve this system of equation by graphing. If the system is inconsistent or the equations are dependent, say so. Please show me all your work so I can see where I am going wrong on this problem.
x-2y=6
x+2y=2
I also need to solve each for y to put in graphing calculator and can't figure it out.
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Solve each equation for "y":
2y=x-6
y = (1/2)x-3
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2y=-x+2
y = (-1/2)x+1
-----------------
The slopes are different so the system is consistent.
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Graph both lines:
graph%28400%2C300%2C-10%2C10%2C-10%2C10%2C%281%2F2%29x-3%2C%28-1%2F2%29x%2B1%29
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Solve by substitution:
(1/2)x-3 = (-1/2)x+1
x = 4
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Substitute to solve for "y":
y = (-1/2)*4+1 = -1
--------------
Final solution (4,-1)
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Cheers,
Stan H.