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loris [4]
4 years ago
14

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

4 0
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

7 0
3 years ago
One side of a regular pentagon measures 0.8 M what is the perimeter of the regular pentagon
sergejj [24]

Answer:

4m

Step-by-step explanation:

0.8x5=4

7 0
4 years ago
It costs $3.75 for 5lbs of food for your puppy. How much is it for 1lb
alex41 [277]
75 cents is for 1lb


I got that answer because I divided 3.75 and 5 and the I got 75 cents
3 0
3 years ago
Melissa scored 120 points in each game how many points did she score in 10 games
Goshia [24]

Answer:

She scored 1200 in all ten games

5 0
3 years ago
Read 2 more answers
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