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Which of the following systems of equations is an example of one where Substitution is the best method?A) {2x−8y=18 {−3x+7y=−27 B) {x=−4 {y=5 C) {y=23x +5 {2x−6y=−42 D) { 3x + 5y = 21 {- 2x+ 7y = 17

Which of the following systems of equations is an example of one where Substitution is the best methodA 2x8y18 3x7y27 B x4 y5 C y23x 5 2x6y42 D 3x 5y 21 2x 7y 1 class=

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Solution:

The substitution method is best used when one of the equations is in terms of one of the variables.

From the system of equations given, the one where substitution is the best method is;

This is because the first equation is already in terms of the variable y.

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