Respuesta :

texaschic101
2x^2 - y = -5
     x + y = 8
----------------add
2x^2 + x = 3 <==

** 2x^2 and x cannot be added because they are not like terms

Answer:

Option 3rd is correct

[tex]2x^2+x=3[/tex]

Step-by-step explanation:

Solve the system of equation:

[tex]x+y = 8[/tex]             ....[1]

[tex]2x^2-y = -5[/tex]            ....[2]

we can write equation [2] as :

[tex]y= 2x^2+5[/tex]

Substitute the value of y in [1] we have;

[tex]x+2x^2+5 = 8[/tex]

Subtract 5 from both sides we have;

[tex]x+2x^2=3[/tex]

or

[tex]2x^2+x=3[/tex]

Therefore, the result we get, [tex]2x^2+x=3[/tex]

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