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If you were to solve the following system by substitution what would be the best variable to solve for and from what equation 2x+6y=9 and 3x-12y=15

Respuesta :

keilonmcalester

Answer:

2x + 6y = 9 , 3x -12y = 15

3x - 12y = 15    3x = 12y + 15    x = 4y + 5

+12y   +12y         /3     /3

2x + 6y = 9 , x = 4y + 5

2(4y + 5) + 6y = 9        2x + 6(-1 / 14) = 9

8y + 10 + 6y = 9            2x - (3/7) = 9

14y + 10 = 9                    2x = 66 / 7

14y = -1                            x = 33 / 7

/14    /14

y = -1 / 14

Answer:

x, in the second equation

Step-by-step explanation:

A P E X

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