SOLUTION: Please help me solve this. Solve by graphing: y=2x y=-2x-8 ___________ ____ It asked for the ordered pair and I got x=-2 and y=-12 but it's wrong. What did I do wrong?

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Question 511865: Please help me solve this.
Solve by graphing:
y=2x
y=-2x-8
________________
It asked for the ordered pair and I got x=-2 and y=-12 but it's wrong. What did I do wrong?
Answer by ankor@dixie-net.com(22740) (Show Source):
You can put this solution on YOUR website!
Solve by graphing:
y = 2x
y = -2x-8
:
You can solve for the ordered pair, in the 2nd equation replace y with 2x
2x = -2x - 8
add 2x to both sides
2x + 2x = -8
4x = -8
x =
x = -2
:
y = 2x
therefore
y = 2*-2
y = -4
:
The ordered pair: -2, -4
:
:
Solve by graphing
1st equation
y = 2x
find y when x=1, and x=-3
x | y
-------
1 | 2
-3 |-6
red graph
2nd equation
y = -2x - 8
find y when x = 1 and x=
x| y
------
1 | -10; y = -2(1) - 8
-3| -2; y = -2(-3) = 9; which is y = +6 - 8
green graph
:
:
Plot these two equations

:
The ordered pair where they intersect, -2, -4