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boyakko [2]
2 years ago
15

If x-y=9,x²+y²=27,then xy=?​

Mathematics
1 answer:
Tresset [83]2 years ago
5 0

Answer:

xy = - 27

Step-by-step explanation:

Note that

(x - y)² = x² - 2xy + y² ← substitute given values, that is

9² = 27 - 2xy

81 = 27 - 2xy ( subtract 27 from both sides )

54 = - 2xy (divide both sides by - 2 )

- 27 = xy

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Step-by-step explanation:

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2 years ago
Find angle GEH, which is located inside inscribed hexagon ABCDEF.
Zinaida [17]

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60°

Step-by-step explanation:

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3 years ago
They want me to put something here and the question is the picture
arsen [322]

Answer:

D. (1, -2)

General Formulas and Concepts:

<u>Pre-Algebra</u>

  • Order of Operations: BPEMDAS
  • Equality Properties

<u>Algebra I</u>

  • Solving systems of equations using substitution/elimination

Step-by-step explanation:

<u>Step 1: Define systems</u>

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<u>Step 2: Rewrite systems</u>

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<u>Step 3: Solve for </u><em><u>x</u></em>

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  2. Divide 13 on both sides:                          x = 1

<u>Step 4: Solve for </u><em><u>y</u></em>

  1. Define:                              3x + 4y = -5
  2. Substitute in <em>x</em>:                 3(1) + 4y = -5
  3. Multiply:                            3 + 4y = -5
  4. Isolate <em>y </em>term:                  4y = -8
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8 0
3 years ago
Garcia wrote the equation y=-0.2x^2+5x-8 to model the path of a soccer ball. What is true about the expression -0.2x^2+5x-8?
shutvik [7]

Answer:

Step-by-step explanation:

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B.  The constant is the number that doesn't have a variable stuck to it.  Our constant, then, is -8, not 2.

C.  The expression does in fact have 3 terms.  Each term is separated from the other terms by either a plus sign or a minus sign.  A polynomial with 3 terms is called a trinomial.

D.  The expression actually factors to x = 1.718... and x = 23.281...  Neither one of those is the factor given in the statement.  

The only one that is true is C.

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