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Viefleur [7K]
3 years ago
5

12. x + y = 4

Mathematics
1 answer:
34kurt3 years ago
3 0

Answer:

x =  -  \frac{2}{3}  \:  \:  \: y =  \frac{14}{3}

Step-by-step explanation:

Since we know -7x=y we use the substitution method and plug it in the top equation.

x + - 7x = 4

- 6x = 4

x =  -  \frac{4}{6}

or x=-2/3

Then plug it back in the the bottom equation

- 7( \frac { - 2}{3} ) = y

y=14/3

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Type the correct answer in each box. find the cofactors of each entry in the first row of the matrix . ac11 = ac12 = ac13 =
natima [27]

The cofactors of each entry in the first row of the matrix are

Ac_11 = -13

Ac_12 = 44

Ac_13 = 27

We have to determine the cofactors of each entry in the first row of the matrix.

Therefore the cofactors of each entry in the first row of the matrix are

Ac_11 = -13

Ac_12 = 44

Ac_13 = 27.

A set of numbers is arranged in rows and columns so as to form a rectangular array. The numbers are called the elements, or entries, of the matrix.

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4 0
2 years ago
HELP PLEASE!⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
valentina_108 [34]
He messed up in the beginning with the 4.

It's supposed to be
(3 - -4)
(3 + 4)

and not

(3-4)

That's where he messed up.




I find it interesting how he uses Xa Ya and Xb Yb. In my school we use X1 Y1 and X2 Y2.
6 0
3 years ago
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