SOLUTION: I have to do the following equation as an elimination and I'm a little confused. I did it on a graph and also as a substitution but got a little confused with this method. Here's

Algebra ->  College  -> Linear Algebra -> SOLUTION: I have to do the following equation as an elimination and I'm a little confused. I did it on a graph and also as a substitution but got a little confused with this method. Here's      Log On


   

Question 970398: I have to do the following equation as an elimination and I'm a little confused. I did it on a graph and also as a substitution but got a little confused with this method. Here's the equation.
y=x-4
y=-x+8
Can someone please show me the way to do the elimination way with steps so I can see where I went wrong. Thanks in advance!
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Add the equations

y = x-4
y = -x+8
---------
2y = 0x + 4

So if 2y = 4, then y = 2 (divide both sides by 2)

Now use y = 2 to get the value of x

y = x-4

2 = x-4

x-4 = 2

x = 2+4

x = 6

-------------------------------------------------------

So the solutions are x = 6 and y = 2. Stated as an ordered pair, the solution is (6,2)