Question 59713
When graphing the following system the two lines __________________.
x+y=4
x+y=-4

{{{highlight(a)}}} are Parallel
b) intersect at one point
c) are the same
d) intersect at two points
e) none of the above
:
For the first equation let x=0 and y=4 Plot (0,4)
Then let y=0 and x=4 Plot (4,0)
Connect the points and you have a line.
For the second equation, let x=0 and y=-4
then let y=0 and x=-4
Connect the points and you have a second line.
Take a look:
{{{graph(300,200,-10,10,-10,10,-x+4,-x-4)}}}