How do you solve the system of equations $5 x + y = 9$ $5x + y = 9$ and $- 10 x + 7 y = 18$ $- 10x + 7y = 18$ ?

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How do you solve the system of equations $5 x + y = 9$ $5x + y = 9$ and $- 10 x + 7 y = 18$ $- 10x + 7y = 18$ ?

1 Answer

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Answer 1 · 2018-06-08T20:17:42

$x = 1, y = 4$ $x=1,y=4$

Explanation:

Multiplying the first equation by $2$ $2$ and adding to the second:
$9 y = 36$ $9y=36$ so $y = 4$ $y=4$
plugging this in the first equation:
$5 x + 4 = 9$ $5x+4=9$ so $x = 1$ $x=1$

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How do you solve the system of equations $5 x + y = 9$ $5x + y = 9$ and $- 10 x + 7 y = 18$ $- 10x + 7y = 18$ ?

1 Answer

Explanation:

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How do you solve the system of equations $5 x + y = 9$ $5x + y = 9$ and $- 10 x + 7 y = 18$ $- 10x + 7y = 18$ ?