spooch
contestada

For the following system, if you isolated x in the second equation to use the Substitution Method, what expression would you substitute into the first equation?

[tex]3x+y=8

-x - 2y= -10[/tex]

A) [tex]-2y + 10
[/tex]

B) [tex]2y + 10

[/tex]

C) [tex]2y − 10
[/tex]

D) [tex]-2y - 10 [/tex]

Respuesta :

bcalle
-x -2y = -10
To isolate x we need to move the y to the right side.
add 2y to both sides.
-x = 2y - 10
The x has to be positive so divide both sides by -1.
x = -2y + 10
LETTER A

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