How do you solve $2 x + 5 y = - 18$ $2x + 5y = -18$ and $3 x - 5 y = 23$ $3x - 5y = 23$ ?

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How do you solve $2 x + 5 y = - 18$ $2x + 5y = -18$ and $3 x - 5 y = 23$ $3x - 5y = 23$ ?

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Answer 1 · 2016-06-13T16:32:11

$x = 1, y = - 4 .$ $x=1, y=-4.$

Explanation:

We add the given eqns. to get, $(2 x + 5 y) + (3 x - 5 y) = - 18 + 23$ $(2x+5y)+(3x-5y)=-18+23$
$:. 5x=5, or, x=1.$
To get $y$ , we use, $x=1$ in the first eqn. & get, $2+5y=-18$ , or, $5y=-20$ , so that, $y=-4.$

The soln. is $x=1, y=-4.$

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How do you solve $2 x + 5 y = - 18$ $2x + 5y = -18$ and $3 x - 5 y = 23$ $3x - 5y = 23$ ?

1 Answer

Explanation:

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How do you solve 2x + 5y = -182x+5y=−182x + 5y = -18 and 3x - 5y = 233x−5y=233x - 5y = 23?

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How do you solve $2 x + 5 y = - 18$ $2x + 5y = -18$ and $3 x - 5 y = 23$ $3x - 5y = 23$ ?