does the system have one solution, no solution, or an infinite number of solutions?
2x-y=5
-4x+2y=-18
a. infinite number b.one c. none

Question

does the system have one solution, no solution, or an infinite number of solutions?
2x-y=5
-4x+2y=-18
a. infinite number  b.one c. none

anonymous · Answer

These two lines are not parallel.

anonymous · Answer

Oh wait. Yes they are.

anonymous · Answer

Bleh. sorry.

$$y = 2x -5 \text{ is the first line}$$
$$y = 2x - 18 \text{ is the second line}$$

They have the same slope (2) but are not the same line. Therefore they have no solutions.

anonymous · Answer

I don't think there's a solution... if you double the first equation and add it to the second, you get:
-4x + 4x -2y + 2x = 10-18
And -8 is not 0...

anonymous · Answer

Yeah, or what he said.

anonymous · Answer

err.
y=2x-9 is the second line. But still not the same line and are parallel therefore no solutions.

anonymous · Answer

lol you guys are funny and pretty good at math gracias (thanks)

anonymous · Answer

Do you see how I arrived at the equations for those lines?

anonymous · Answer

yes i am very much begining to understand :)