Math
posted by Amanda .
1. Explain the advantages and disadvantages of both the substitution method and the elimination method for solving a system.
Help please. The only reasons I can think of is because in substitution it might be more difficult cause there's a possibility of working with fractions.

Math 
Reiny
Actually, that is the best reason.
I use the following criterium.
If I see one of the variables having a coefficient of 1 OR 1, I solve for that variable and use substitution, resulting in no fractions, unless the equation contains fractions to begin with.
As a matter of fact if I see fractions in either one of my equations, I usually multiply each term by the LCD of the fractions, thereby eliminating the fractions.
g. 4x+5y = 12
3xy = 9
I would solve for y in the second, then sub that into the first.
Of course if the answer itself is a fraction you would be stuck with thAT.
Respond to this Question
Similar Questions

Substitution MethodPlz help
Use the Substitution method to solve the system of equations. x + y = 4 x  y = 2 solve for x in the second equation. x= y+2 Put that in for x in the first equation: x+y=4 (y+2) + y = 4 solve for y. Then, x= y+2 i don't get it.How … 
MATH
Useing substitution/elimination method what is the solution set to 2x+y=1 x^2=y+2 a)(3,7) and (1,1) b)(3,7) and (1,1) c)(3,7) and (1,1) d)(3,7) and (1,1) I've really no educated guess so PLEASE HELP! You can make an educated … 
Algebra
Solving system of linear equations by using the apropiate method name the method and the x,y coordinates 1)X=4y+8 2x8y=3 2)3x7y=6 elimination method 2x+7y=4 (2,0) 3)5x2y=12 elimination method 3x2y=2 (7,23/2) 4)9x8y=42 elimination … 
MATH
Solving by graphing DQ 1 Solving by substitution Solving by elimination Which method do you think would be best to solve this system? 
Algebra
Explain why the addition method might be preferred over the substitution method for solving the system 2x3y=5 5x+2y=6 Am lost on these.Please help 
Algebra
Explain why the addition method might be preferred over the substitution method for solving the system 2x3y=5 5x+2y=6 
algebra
Explain why the addition method might be preformed over the substitution method for solving the system 2x – 3y = 10 5x + 2y = 6 What is the solution of this system? 
Algebra 1
bobpursey, In this problem you helped me with earlier: Solve using any appropriate method. y = 2×  5, y = ½× + 1 Substitution, substitute for y. 2×5=½ × + 1 3/2 x=6 x=4 y= 2*45=3 How did you choose which method you were going … 
pre calculus
Describe the advantages and disadvantages of The method of substitution”, “The method of graphing”, and “The method of elimination” of solving systems of equations 
Algebra PLEASE HELP!!
What advantages does the method of substitution have over graphing for solving systems of equations?