Question #22da8

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Question #22da8

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Answer 1 · 2017-10-28T13:08:39

$x = 2$ $x = 2$
$y = 1$ $y = 1$

Explanation:

1) $2 x + y = 5$ $2x + y = 5$
2) $3 x + y = 7$ $3x + y = 7$

Subtract equation 1 from equation 2:
$3 x - 2 x = x$ $3x - 2x = x$
$y - y = 0$ $y - y = 0$
$7 - 5 = 2$ $7 - 5 = 2$

Therefore, $x = 2$ $x = 2$ .

Substitute $x = 2$ $x = 2$ into either equation:
$2 x + y = 5$ $2x + y = 5$
$(2 \cdot 2) + y = 5$ $(2 * 2) + y = 5$
$4 + y = 5$ $4 + y = 5$
$y = 1$ $y = 1$

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Question #22da8

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