juan4105var juan4105var

20-02-2018
Mathematics

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which method is most efficient in solving a system of linear equations when the two equation have x-values with opposite coefficient values

A. GUESS AND CHECK
B. GRAPHING
C. SUBSTITUTION
D. ELIMINATION

Respuesta :

jimthompson5910 jimthompson5910

20-02-2018

Answer: D) Elimination

For example, consider the system of equations below
2x+3y = 9
-2x+6y = 18
Adding straight down will have the x terms (2x and -2x) add to 0x which is just 0. The x terms will go away. In this case, the 2 and -2 are opposite coefficient values for the x terms.

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