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Vadim26 [7]
3 years ago
5

(Can someone help it’s due tomorrow) x^2 -3xy x= -7 and y=4

Mathematics
2 answers:
bazaltina [42]3 years ago
7 0

Answer:

35

Step-by-step explanation:

Substitute every detail given

(-7)^2 -3(-7)(4)

-49 - (-21) × 4

-49 + 84

35

adelina 88 [10]3 years ago
7 0
X^2 - 3xy = (-7)^2 - 3(-7)(4)

= 49 + 84

= 133

Make sure you remember that (-7)^2 = (-7)(-7) = positive 49
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Examine this system of linear equations. y – x = 2, x + y = 4 Which is a solution of the system of equations? (1, 3) (2, 2) (3,
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Answer:

(1, 3)

Step-by-step explanation:

Solve the following system:

{y - x = 2 | (equation 1)

{x + y = 4 | (equation 2)

Add equation 1 to equation 2:

{-x + y = 2 | (equation 1)

{0 x+2 y = 6 | (equation 2)

Divide equation 2 by 2:

{-x + y = 2 | (equation 1)

{0 x+y = 3 | (equation 2)

Subtract equation 2 from equation 1:

{-x+0 y = -1 | (equation 1)

{0 x+y = 3 | (equation 2)

Multiply equation 1 by -1:

{x+0 y = 1 | (equation 1)

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Collect results:

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3 years ago
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Answer:

<em>The magnitude of the velocity will be 60 m/s.</em>

<em>The distance covered is 3,600 m</em>

Step-by-step explanation:

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