3 years ago

I need help?? please help

1 answer:

3 0

Its easy you just have to do the pi formula

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slamgirl [31]

Answer:

$y=\frac{26}{7},\:x=-\frac{15}{7}$

Step-by-step explanation:

$\begin{bmatrix}4x+5y=10\\ -2x+y=8\end{bmatrix}\\\\\begin{bmatrix}-2\cdot \frac{10-5y}{4}+y=8\end{bmatrix}\\\\$

$-5+\frac{7y}{2}=8\\\\\mathrm{Multiply\:both\:sides\:by\:}2\\-5\cdot \:2+\frac{7y}{2}\cdot \:2=8\cdot \:2\\-10+7y=16\\y=\frac{26}{7}\\$

$\mathrm{For\:}x=\frac{10-5y}{4}\\\mathrm{Subsititute\:}y=\frac{26}{7}\\x=\frac{10-5\cdot \frac{26}{7}}{4}\\\\$

$x=-\frac{15}{7}\\$

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3 years ago

Black_prince [1.1K]

Answer:

C or D as they are Identical

Step-by-step explanation:

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3 years ago

pshichka [43]

A=27.18
There is a photo showing the answer and the formula and stuff hope this helps

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3 years ago

pav-90 [236]

Answer:

The answers are in the picture

Step-by-step explanation:

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3 years ago

Naddik [55]

1- D. 9x2yz
2- C. 2x2y + x2 − 3x + 4
3- A. x + 2xyz
4- B. 3x + y + z

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3 years ago