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Naya [18.7K]
3 years ago
15

What is the answer to x+y=12 X=2+y

Mathematics
1 answer:
Vlad [161]3 years ago
6 0

Answer:

y=  − x + 12

x=  − x + 14

Step-by-step explanation:

Solve for the first variable in one of the equations, then substitute the result into the other equation.

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juin [17]

Answer:

{ \underline{ \sf{x  \: is  \:  \: \{ \frac{ - 5 + i \sqrt{35} }{10} \} } \:  \: and \:  \:  \{ \frac{ - 5  - i \sqrt{35} }{10}  \}} }

Step-by-step explanation:

5 {x}^{2}  + 4x + 3 = 0

from quadratic formular:

{ \sf{x =  \frac{ - b± \sqrt{ {b}^{2} - 4ac } }{2a} }}

general equation:

{ax}^{2}  +  bx + c = 0

a is 5, b is 4 and c is 3:

substitute in formular:

{ \sf{x =  \frac{ - 5± \sqrt{ {5}^{2} - (4 \times 5 \times 3) } }{(2 \times 5)} }} \\  \\ { \sf{x =  \frac{ - 5± \sqrt{ - 35} }{10} }}

but from complexes, <em>i</em><em>²</em><em> </em><em>=</em><em> </em><em>-</em><em>1</em>

{ \sf{x =  \frac{ - 5± \sqrt{35 {i}^{2} } }{10} }} \\  \\  = { \sf{x =   \frac{ - 5±i \sqrt{35} }{10} }}

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