View Full Version : Need Some Math Advice..
MandyMarieLove
Feb 25, 2010, 10:40 AM
Identify the type of system of equations for the system below.
2y = 4 – 6x
3y + 9x = 6
How do I figure out the answer to this questionn, again I am not looking for the answer, just some help. :]
ebaines
Feb 25, 2010, 11:18 AM
I don't know how to guide you without giving the answer away. So I will ask for your commitmnt to please read the two web pages referenced in the answer that follows.
You have two equations that together are a "system" - so these are simultaneous equations. This term applies whenever you have more than one equation making up a system. Please see: Simultaneous equations - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Simultaneous_equations)
Both equations have x and y terms to the first power only - that is, there are no terms like x squared, y cubed, etc. So these are "first order" equations, also known as "linear" equations because when you plot them on a graph they come out as lines. Please see: Linear equation - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Linear_equation)
Hence these are "simultaneous linear equations."
MandyMarieLove
Feb 25, 2010, 01:05 PM
Could you answer if the if this would be correct..
There's intersecting lines, so there's different slopes and y intercepts and it is consistent and independent, and there is one solution..
I believe I am right, and doing this all right, if you could answer whether I am or not, it will tell me whether I am doing it right..
Again, thanks!
MandyMarieLove
Feb 25, 2010, 01:09 PM
And when I am putting the equations into y=mx+b, if the equation looked like this.. 2y=4x+2, wouldn't I want to get the y by itself by dividing by two?
ebaines
Feb 25, 2010, 02:10 PM
Upon further review: if you divide through the first equation by 2, you'll get it into the form y = mx + b. Then divide the second equation by 3 and rearrange so that it too is in the form y = mx+b, and you'll find that these two equations both represent the same line! Same slope, same y intercept. Sorry I didn't catch that before.