Mathematics: How resolve this equation 2x^2-3x-y=-5 -x+y=5

How resolve this equation 2x^2-3x-y=-5 -x+y=5

Ответ:

patrickwilson

16.01.2022

$-x+y=5\Rightarrow y=x+5$

Substitute

in the other equation:
$2x^{2}-3x-(x+5)=-5$
$\Rightarrow 2x^{2}-3x-x-5=-5$
$\Rightarrow 2x^{2}-4x-5=-5$
$\Rightarrow 2x^{2}-4x=0$
$\Rightarrow 2x(x-2)=0$

So either
$2x=0\Rightarrow x=0\Rightarrow y=0+5=5$
or
$x-2=0\Rightarrow x=2\Rightarrow y=2+5=7$

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Ответ:

glazevaida9

23.10.2022

Mathematics

Step-by-step explanation:

The degree measure of a line is (180) degrees. As per the given picture, angles (a), (b), and the (90) degree angle form a straight line. Please note that an angle with a box around it is always a (90) degree angle.

Using the given information, one can form an equation and solve for the sum of angles (a) and (b);

a + b + 90 = 180

Inverse operations,

a + b = 90

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How resolve this equation 2x^2-3x-y=-5 -x+y=5

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