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NNADVOKAT [17]
3 years ago
15

Solve the system of equations x+y=-1 and 5x-7y=79 by combining the equations.

Mathematics
1 answer:
Leya [2.2K]3 years ago
6 0

9514 1404 393

Answer:

  (x, y) = (-6, -7)

Step-by-step explanation:

Multiply the first equation by 7 and add that to the second.

  7(x +y) +(5x -7y) = 7(-1) +(79)

  12x = 72

  x = 6

  y = -1 -x = -1 -6 = -7

The solution is (x, y) = (6, -7).

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Step-by-step explanation:

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6 0
3 years ago
Read 2 more answers
If 32% of a number is 64 what is the number
Vladimir [108]

Step-by-step explanation:

Let the required number be x

32\%  \: of \: x = 64 \\  \\  \frac{32}{100}  \times x = 64 \\  \\ x = 64 \times  \frac{100}{32}  \\  \\ x = 2 \times 100 \\  \\ x = 200

Thus, the required number is 200.

6 0
3 years ago
Read 2 more answers
Find the product (4x-5y)^2
sleet_krkn [62]
To find the product of (4x-5y)^2,
we can rewrite the problem as:
(4x-5y)(4x-5y) (two times because it is squared)

Now, time to use that old method we learned in middle school:
FOIL. (Firsts, Outers, Inners, and Lasts)

FOIL can help us greatly in this scenario.
Let's start by multiplying the 'Firsts' together:
4x * 4x = <em>16x^2</em>

Now, lets to the 'Outers':
4x * -5y = <em>-20xy</em> 

Next, we can multiply the 'Inners':
-5y * 4x = <em>-20xy</em>

Finally, let's do the 'Lasts':
-5y * -5y = <em>25y</em>^2

Now, we can take the products of these equations from FOIL and combine like terms. We have: 16x^2, -20xy, -20xy, and 25y^2.
-20xy and -20xy make -40xy.

The final equation (product of (4x-5y)^2) is:
16x^2 - 40xy + 25y^2

Hope I helped! If any of my math is wrong, please report and let me know!
Have a good one.
4 0
3 years ago
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IRINA_888 [86]

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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