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Sophia.13
• When should you solve a system of equations by graphing? • When should you solve a system of equations by elimination? • When should you solve a system of equations by substitution?
If you are looking at linear equations it really its at your choice... you can solve any system of equations by any of the methods... quadratic or higher and a linear, I use substitution most of the time... but again, this can be done graphically you can solve any equation graphically e.g. x + 3 = 5 just graph y = x + 3 and y = 5... it will show you x = 2
Depends on what the question looks like. Elimination is usually the easiest, but it gets tricky sometimes. I only use graphing as a last option and professor dont usually ask this
Those wt really know how to answer them. asked me , i dont really know how to answer them each individually
If you're given: `x` = 3 + y 2x + 5y = 7 Use `substitution` since in this case, x is isolated and you can substitute the expression for x in the first equation into the second equation. However if you're given: x `+ 2y` = 4 3x `- 2y` = 5 Use `elimination` since you can simply add both equations together to get rid of the y variable.
If given `y` = 2x - 3 `y` = 5x - 4 Then use `graphing` since both equations are in the form y = mx + b. You can simply enter both equations into your graphing calculator to find the (x,y) intersection point.