How do you solve $3 x + y = 21$ $3x+y=21$ and $x + y = 1$ $x+y=1$ ?

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How do you solve $3 x + y = 21$ $3x+y=21$ and $x + y = 1$ $x+y=1$ ?

1 Answer

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Answer 1 · 2016-01-29T11:05:27

$x = 10; y = - 9$ $x=10; y= -9$

Explanation:

$3 x + y = 21$ $3x + y =21$ (1)
$x + y = 1$ $x + y = 1$ (2)
Subtracting (2) from (1) we get $2 x = 20 or x = 10$ $2x =20 or x = 10$ $and y = 1 - 10 = - 9 [A n s w e r]$ $andy= 1-10 =-9 [Answer]$

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How do you solve $3 x + y = 21$ $3x+y=21$ and $x + y = 1$ $x+y=1$ ?

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How do you solve 3x+y=213x+y=213x+y=21 and x+y=1x+y=1x+y=1?

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How do you solve $3 x + y = 21$ $3x+y=21$ and $x + y = 1$ $x+y=1$ ?