4 years ago

I need help with 4th grade math on IXl

Mathematics

2 answers:

tatyana61 [14]4 years ago

4 0

What do you need help with?

ira [324]4 years ago

3 0

Answer:

What is the question

Step-by-step explanation:

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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

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

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

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3 years ago

If like age is represented by x which of the following would represent his bother age

Zigmanuir [339]

Answer:

y but can you give more details

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One side of a regular pentagon measures 0.8 M what is the perimeter of the regular pentagon

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Answer:

Step-by-step explanation:

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It costs $3.75 for 5lbs of food for your puppy. How much is it for 1lb

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75 cents is for 1lb

I got that answer because I divided 3.75 and 5 and the I got 75 cents

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