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zzz [600]
3 years ago
7

What's the solution for 2x 7y=2 x y=-1

Mathematics
1 answer:
Lerok [7]3 years ago
5 0
<span>Simplifying

(2x + -7y ) = 0

Multiply
(2x + -7y) * (x + y) </span><span>
(2x * (x + y) + -7y * (</span><span>x + y)) = 0
</span>((x * 2x + y * 2x) + -7y * (x + y)) = 0<span>

</span>Reorder the terms:
((2xy + 2x2) + -7y * (x + y)) = 0
((2xy + 2x2) + -7y * (x + y)) = 0
(2xy + 2x2 + (x * -7y + y * -7y)) = 0
(2xy + 2x2 + (-7xy + -7y2)) = 0<span>

Reorder the terms:
(2xy + -7xy + 2x2 + -7y2) = 0
</span>
<span>Combine like terms: 2xy + -7xy = -5xy
(-5xy + 2x2 + -7y2) = 0

</span>Solving -5xy + 2x2 + -7y2 = 0<span>

Solving for variable 'x'.

Factor a trinomial. 
(2x + -7y)(x + y) = 0
</span>



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The deli gets 1212 -pound blocks of cheese. They slice the cheese into \frac{1}{4} 4 1 ​ - pound and \frac{1}{2} 2 1 ​ - pound p
Novosadov [1.4K]

Answer:

24

Step-by-step explanation:

Based on the question given :

Total pounds of cheese = 12

These cheese are sliced into 1/4 pounds and 1/2 pounds packages.

What the question requests is the number of 1/2 pounds fraction we can get from the total 12 pounds of cheese.

This means we aren't cutting out 1/4 pounds fraction from this package as the question didn't specify.

Hence, the number of 1/2 pounds fraction obtainable from 12 pounds of cheese I s:

We divide the 12 pounds cheese by 1/2

This gives :

12 ÷ 1/2 ; 12 / 1/2

÷ change to multiplication ond the reciprocal of the denominator is used

12 * 2 /1 = 24 /1

We Obtain 24 1/2-pound cheese

6 0
3 years ago
Please help 4th grade 3 questions
ivanzaharov [21]

b for number 1 do u need all of them

4 0
3 years ago
Read 2 more answers
(- 9 - 7i ) + (16 +5 i)
Pachacha [2.7K]

Answer:

 7 - 2i

Step-by-step explanation:

Here we have two complex numbers and wish to combine them.  Complex numbers have real and imaginary parts.  We sum up the real parts and the imaginary parts separately:

 -9 - 7i

+16 + 5i

------------

 7 - 2i      This is the sum of -9 -7i and 16 + 5i.

8 0
3 years ago
HELPPPPP ASAAPP PLEASE !!
Mrac [35]
2y-7=0 or 2-y=0
Y=7/2 or y= 2
6 0
3 years ago
Find the perimeter of the square:
Anna [14]

By definition a square has all 4 sides equal, the area of a square is sxs or s^2, so s^2 = 400, s = square root of 400 = 20. All sides will be equal to 20 m. The perimeter is the sum of the sides or 4 x s or 80.

Steps:

A= L^2

Where L is length of the side

400=L^2 》》》》》 square root

L= 20 all sides of square are 20 m

P = 4L

=4(20)

=80m

7 0
3 years ago
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