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3 years ago

MYP 1 Mathematics Unit 4 Summative Assessment; An example please!

1 answer:

6 0

You just have to answer to all of the questions and bullet points. Think about them, and do some sketches. In the end that will help you to end the assignment.

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Solve the system of equations by transforming a matrix representing the system of equation into reduced row echelon form.

Gekata [30.6K]

Take the augmented matrix,

$\left[\begin{array}{ccc|c}2&1&-3&-20\\1&2&1&-3\\1&-1&5&19\end{array}\right]$

Swap the row 1 and row 2:

$\left[\begin{array}{ccc|c}1&2&1&-3\\2&1&-3&-20\\1&-1&5&19\end{array}\right]$

Add -2(row 1) to row 2, and -1(row 1) to row 3:

$\left[\begin{array}{ccc|c}1&2&1&-3\\0&-3&-5&-14\\0&-3&4&22\end{array}\right]$

Add -1(row 2) to row 3:

$\left[\begin{array}{ccc|c}1&2&1&-3\\0&-3&-5&-14\\0&0&9&36\end{array}\right]$

Multiply through row 3 by 1/9:

$\left[\begin{array}{ccc|c}1&2&1&-3\\0&-3&-5&-14\\0&0&1&4\end{array}\right]$

Add 5(row 3) to row 2:

$\left[\begin{array}{ccc|c}1&2&1&-3\\0&-3&0&6\\0&0&1&4\end{array}\right]$

Multiply through row 2 by -1/3:

$\left[\begin{array}{ccc|c}1&2&1&-3\\0&1&0&-2\\0&0&1&4\end{array}\right]$

Add -2(row 2) and -1(row 3) to row 1:

$\left[\begin{array}{ccc|c}1&0&0&-3\\0&1&0&-2\\0&0&1&4\end{array}\right]$

So we have $\boxed{x=-3,y=-2,z=4}$ .

3 0

3 years ago

- Rachel earned $54.79 last week. Morgan earned $50.23. About how much more did Rachel earn?

katovenus [111]

Answer:

Step-by-step explanation:

4.56 $

6 0

3 years ago

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the length of a rectangle is 4 1/6 inches and the width of the rectangle is 8 2/3 inches what is the area of the rectangle

V125BC [204]

36 1/9 is the area
thanks

8 0

3 years ago

Can someone tell me the answer and explanation plz I’ll give brainlist points

MAVERICK [17]

Answer:

Step-by-step explanation:

to cancel out the bottom part of the fraction, we multiply by 3. so now we have y+1= 6. we subtract 1, and get y=5

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3 years ago

An athlete runs 90 laps in 6 hours. This is the same

kolezko [41]

Im thinking the answer is c

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3 years ago

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