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Lera25 [3.4K]
3 years ago
11

Solve by substitution: 2x-y = -5 -x+-y =10

Mathematics
2 answers:
Elenna [48]3 years ago
6 0
2x-y=-5
-x-y=10
3x=-15
x=-5
-10-y=-5
-y=-5+10
-y=5
y=-5
HOPE I HELPED!!!
vlabodo [156]3 years ago
3 0

<span><span>{2x-y = -5 => -y=-5-2x    /*(-1)    y=2x+5
{-x+-y =10</span></span>

<span><span><em> Substitute y in the second equation:</em></span></span>

<span><span>-x-y=10</span></span>

<span><span>-x-(2x+5)=10</span></span>

<span><span>-x-2x-5=10</span></span>

<span><span>-3x-5=10    /+5</span></span>

<span><span>-3x=15     /:(-3)</span></span>

<span><span>x=-5</span></span>

<span><span>y=2x+5=2*(-5)+5=-10+5=-5</span></span>

<span><span>y=-5</span></span>

<span><span><u>Solution:</u>   (-5; -5)</span>
</span>

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