How do you solve $x + y = 12$ $x + y = 12$ , $y = 2 x$ $y =2x$ using substitution?

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How do you solve $x + y = 12$ $x + y = 12$ , $y = 2 x$ $y =2x$ using substitution?

1 Answer

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Answer 1 · 2016-03-08T23:44:01

$x = 4 and y = 8$ $x=4 and y=8$

Explanation:

$x + y = 12 \to y = 12 - x$ $x+y = 12 -> y=12-x$
$y = 2 x$ $y=2x$
which means $12 - x = 2 x \to 3 x = 12 \to x = 4$ $12-x=2x -> 3x=12 -> x=4$
replace x in one of the equations above, for exemple the 2nd :
$y = 2 \cdot 4 = 8$ $y=2*4=8$

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How do you solve $x + y = 12$ $x + y = 12$ , $y = 2 x$ $y =2x$ using substitution?

1 Answer

Explanation:

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Humanities

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How do you solve x + y = 12x+y=12x + y = 12, y =2xy=2x y =2x using substitution?

1 Answer

Explanation:

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How do you solve $x + y = 12$ $x + y = 12$ , $y = 2 x$ $y =2x$ using substitution?