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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? 2x + y = 8
−x − 3y = −12

Respuesta :

texaschic101
-x - 3y = -12
-x = 3y - 12..multiply by -1 to make x positive
x = -3y + 12
so u would sub in -3y + 12 for x in the first equation
TaeKwonDoIsDead

Answer:

[tex]x=12-3y[/tex]


Step-by-step explanation:

Question wants to know WHAT EXPRESSION would you substitute into Equation 1 IF you solve for x in Equation 2.


Let's do some algebra and solve for x in Equation 2:

[tex]-x-3y=-12\\-x=-12+3y\\x=\frac{-12+3y}{-1}\\x=12-3y[/tex]

This is the expression we would substitute into  [tex]x[/tex]  of Equation 1 in order to use substitution method and solve.