3 years ago

Need help please and thank u

Mathematics

1 answer:

BigorU [14]3 years ago

6 0

Oof. Sorry I can't help you there

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Using Cramer's rule to solve linear systems.

Rzqust [24]

Answer: Last Option

$x=2,\ y=-5$

Step-by-step explanation:

Cramer's rule says that given a system of equations of two variables x and y then:

$x =\frac{Det(A_X)}{Det(A)}$

$y =\frac{Det(A_Y)}{Det(A)}$

For this problem we know that:

$Det(A) = |A|=\left|\begin{array}{ccc}4&-6\\8&-2\\\end{array}\right|$

Solving we have:

$|A|= 4*(-2) -(-6)*8\\\\|A|=40$

$Det(A_X) = |A_X|=\left|\begin{array}{ccc}38&-6\\26&-2\\\end{array}\right|$

Solving we have:

$|A_X|=38*(-2) - (-6)*26\\\\|A_X|=80$

$Det(A_Y) = |A_Y|=\left|\begin{array}{ccc}4&38\\8&26\\\end{array}\right|$

Solving we have:

$|A_Y|=4*(26) - (38)*8\\\\|A_Y|=-200$

Finally

$x =\frac{|A_X|}{|A|} = \frac{80}{40}\\\\x=2$

$y =\frac{|A_Y|}{|A|} = \frac{-200}{40}\\\\y=-5$

4 0

3 years ago

NEED ANSWER ASAP!!! PLEASE HELP

lys-0071 [83]

Answer:

Answer "C"

Step-by-step explanation:

I believe this because it would not make sense to compare the already known equation to the unknown equation and does make sense to compare the unknown equation to the known equation

(pls dont delete this moderators)

3 0

2 years ago

Which of the points satisfy the linear inequality graphed here?

SOVA2 [1]

Only
<span>c) (-10,0)
because that is the only point in the shaded region.
</span>

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3 years ago

Can someone help me???

Tatiana [17]

Which one 1 2 or idk3?

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3 years ago

Find the median, first quartile, third quartile, and interquartile range of the data

s344n2d4d5 [400]

Answer:

median 88 first 84 third 92

Step-by-step explanation:

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3 years ago