As you have seen, there are many ways to solve this word problem. Now, some word problem or systems of equations will make it easier to solve a certain way than others.
Examples:
2x+5y = 12
3x-5y = -7
Elimination would be easiest because you can just add the two equations and immediately get rid of the y variable.
Whereas a problem like this:
x=2y-1
2x+7y=9
Would be best solved by substitution since it is already solved for x. Now, just put that in the 2nd equation.
This problem
7x-5y=2
13x-7y=6
would work very well with Cramer's rule.
While this problem:
3.457x-9.28y=23.87
4.672x+12.82345y=-1.0023
I would jump right on one of the websites I mentioned! I wouldn't waste my time with any of the other methods. Yes, it is fine to use a calculator or website to solve problems but you shouldn't use them for easier problems.
A problem like:
x+3y=4
2x-5y=-3
Would be great with gaussian elimination.
So, knowing many methods will be very helpful to solving problems quickly and accurately.
Remember, if you need help, contact me. I have VERY affordable rates.
No comments:
Post a Comment