If $3 x + 5 y = 4$ $3x + 5y = 4$ and $8 y + 6 x = 36$ $8y + 6x = 36$ , what is the value of $- y$ $-y$ ?

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If $3 x + 5 y = 4$ $3x + 5y = 4$ and $8 y + 6 x = 36$ $8y + 6x = 36$ , what is the value of $- y$ $-y$ ?

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Answer 1 · 2018-08-06T05:32:10

$- y = 14$ $-y=14$

Explanation:

$3 x + 5 y = 4$ $3x+5y=4$
$8 y + 6 x = 36$ $8y+6x=36$
$- y = ?$ $-y=?$
$3 x + 5 y = 4 - - - - - - - - - - - - (1)$ $3x+5y=4------------(1)$
$8 y + 6 x = 36 - - - - - - - - - - - - (2)$ $8y+6x=36------------(2)$
$(2)$ $(2)$ can be simplified as
$3 x + 4 y = 18 - - - - - - - - - - - (3)$ $3x+4y=18-----------(3)$
Subtracting (1) from (3)
$4 y - 5 y = 18 - 5$ $4y-5y=18-5$
$- y = 14$ $-y=14$

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If $3 x + 5 y = 4$ $3x + 5y = 4$ and $8 y + 6 x = 36$ $8y + 6x = 36$ , what is the value of $- y$ $-y$ ?

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Explanation:

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If $3 x + 5 y = 4$ $3x + 5y = 4$ and $8 y + 6 x = 36$ $8y + 6x = 36$ , what is the value of $- y$ $-y$ ?